Meiosis: Where the Sex Starts - Crash Course Biology #13
Рет қаралды 5,144,229
Күн бұрынHank gets down to the nitty-gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.
References:
faculty.clintoncc.suny.edu/fac...
www.genome.gov/Glossary/index...
www.sumanasinc.com/webcontent/...
sun.menloschool.org/~dspence/b...
Table of Contents
1) Homologous Chromosome Pairs 2:10
2) Primary Oocytes 3:30
3) Primary Spermatocytes 3:30
4) Meiosis 2:59
5) Interphase I 4:04
6) Prophase I 4:37
a) Crossover 5:05
b) Recombination 5:05
7) Metaphase I 7:53
8) Anaphase I 8:05
9) Telophase I 8:19
10) Prophase II 8:57
11) Metaphase II 9:23
12) Anaphase II 9:28
13) Telophase II 9:32
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@mn7804 8 жыл бұрын
I find it funny that instead of having a picture of john, they just filmed him standing there, silently, not moving for like a good 30 seconds.
@RTS64 8 жыл бұрын
Ya your right lol
@dorianalacitignola7700 8 жыл бұрын
+Nissa Smith I WAS DYING WHEN I SAW THAT LOLOLOL
@queenskyster8768 8 жыл бұрын
+Nissa Smith He didn't even blink!
@aljan6 8 жыл бұрын
+Nissa Smith i died when he said "I'm way better in assasins creet than him" xDDD
@sdurairaj8094 8 жыл бұрын
Moueies
@pacandpal3 5 жыл бұрын
i like how he brings his brother on just to roast him on his genetic traits .
@DizzyDior12 8 жыл бұрын
Good luck to everyone who has finals this week. *cries quietly into textbook at **2:35**am*
@andrescelano4179 8 жыл бұрын
EOC tomorrow kms
@Macwithdachiknstripz 8 жыл бұрын
+Dizzy Lizzie I have my Biology Final tomorrow morning :( I hope you did well!
@andrescelano4179 8 жыл бұрын
Ashton Bailey rip you
@toooydoeur 8 жыл бұрын
Bio keystones tomorrow
@andrescelano4179 8 жыл бұрын
TheCrazyNintendoMan ! mario galaxy
@queenskyster8768 8 жыл бұрын
Anyone else was expecting John to be all like "Hey!"
@Tybeuf 8 жыл бұрын
+DrunkOnAnime yep i was so disappointed he didn't argue back or something
@queenskyster8768 8 жыл бұрын
IKR!
@aliatee1942 7 жыл бұрын
Yup.
@alexshi1679 6 жыл бұрын
QueenJoou This one is Hank not John.
@pshwow 6 жыл бұрын
Alex Shi John is in the beginning lol..they filmed him for like 30 seconds just still
@JKONNN 9 жыл бұрын
110% relying on your mitosis and meiosis vids to pass bio.
@thesilverdealer7193 6 жыл бұрын
Juzzy K big facts
@aprilfoozeler 2 жыл бұрын
For those who say these videos helped them pass a grade. I mean sure, thanks to the videos you guys passed and we are very grateful for his videos, BUT give some credit to yourself. Even if you did not get that passing grade, you did something fewer and fewer people do nowadays: trying your best and taking the initiative. YOU took the time and effort to watch the videos and CHOOSE to learn! That kind of determination and diligence is admirable and very commendable! :D
@vanxssaisaac 7 жыл бұрын
You've taught me so much more than my teacher ever has. Thank you so much for saving my grades.
@ryanw8778 7 жыл бұрын
Sameee
@kaitlingraves98 7 жыл бұрын
Vanessa Isaac
@jaylee7447 4 жыл бұрын
( ͡° ͜ʖ ͡°)
@ellw7830 4 жыл бұрын
gotta love horribly underfunded yet mandatory education systems lololollolo
@conchiludovice9002 6 жыл бұрын
I HAVE AN EXAM IN 30 MINUTES AND IM CRAMMING ALL THIS INFORMATION INTO MY BRAIN BECAUSE I DIDNT LEARN ANYTHING FROM MY TEACHER WISH ME LUCK!!!!!!!!!!!!!!!!!
@greennitricoxide2706 5 жыл бұрын
how'd you do?
@faithsheppard886 5 жыл бұрын
how did it go?
@glennmatthews758 5 жыл бұрын
U good?
@mikaelashereehires 4 жыл бұрын
I'm guessing it didn't go too well lmao
@pipermclean1721 4 жыл бұрын
How'd u do?
@Msrussianbeauty20 9 жыл бұрын
WE NEED TEACHERS LIKE YOU IN SCHOOLS!!!
@ZeeGhost713 6 жыл бұрын
Ms Kate be careful what you wish for for all you know he might make us make a project on it, your partner has to watch the video with you, partner has to be opposite gender, has to bring model home and show you parents how it happened (0_0)
@TheLucyOlivia 9 жыл бұрын
The only reason i'll pass biology is because of these videos
@EnglishProgects 9 жыл бұрын
Preach
@davidcheese1032 9 жыл бұрын
Lucy Olivia these are making up a chunk of my AS revision thank you so much Hank
@thegone7 7 жыл бұрын
OMG! These videos are really good, I used to be suck at science, but these videos are a godsend. Comment if you agree.
@rachelsmith2755 6 жыл бұрын
Lucy Olivia same
@nickfamous 6 жыл бұрын
Lucy Olivia same
@puralucid 8 жыл бұрын
You are saving my career as a biologist.
@imnew2nm324 6 жыл бұрын
I'm a BIO teacher, and I review these because they are so much faster than going back to the text.
@missunknownps3 7 жыл бұрын
who else got an exam tomorrow? lol
@defaultmesh 7 жыл бұрын
missunknownps3 meeeee!!! biology to be exact, about mitosis and meiosis to be exact
@NaturalGirlForChrist 7 жыл бұрын
yes bio lab final :(((((
@cafe_jazz_7836 7 жыл бұрын
love that profile picture missunknownps3
@anuraghooda8439 7 жыл бұрын
missunknownps3 I have biology exam tomorrow.
@Shadyroze 7 жыл бұрын
It's midnight and I have an entire semester exam tomorrow hah
@brandonkim8423 10 жыл бұрын
Such Crash Course. Much Science. Very Biology. So Green Brothers. Wow.
@wonjaejang8975 10 жыл бұрын
much doge
@douglasw1545 7 жыл бұрын
Amaze
@annsuya_8364 6 жыл бұрын
Bamboozle
@QuillWorks 5 жыл бұрын
Such 2014
@sanjanaj5055 7 жыл бұрын
Cramming for a test tomorrow! This is so helpful! Teachers take two days to finish what he did in like 10-11 min
@a1egua881 7 жыл бұрын
I'm also cramming in a study session for tomorrow's test
@sanjanaj5055 7 жыл бұрын
This video helped me so much!! study sessions help too,but i missed mine
@squidneythesquid2487 7 жыл бұрын
Sanjana Jothimurugan I'm doing this 20 minutes before my biology exam
@rafaelavila9571 7 жыл бұрын
Sanjana Jothimurugan i bet you failed
@notava6601 6 жыл бұрын
nah G they take like a week at my shitty public school
@christophersalem7080 6 жыл бұрын
imagine how hard it was for john to just stand still and have to listen to hank
@alecmcleod3306 8 жыл бұрын
I dare you to watch from 0:33-0:42 at half speed and not think about how Hank sounds drunk
@reecedr98 8 жыл бұрын
Dude, you are a legend
@maxe381 8 жыл бұрын
I just did this...and THIS is how I imagine him at a party, wasted, trying to science... LOL
@ashleighs8483 7 жыл бұрын
I died laughing lol!
@markopolo8910 7 жыл бұрын
LMAO! Thank you!
@abhishekagrahara8248 7 жыл бұрын
especially when he sais ughhhh duuuuuuude
@xBustedHeart 9 жыл бұрын
if you were my teacher I'd be getting an A ++++++++++++++++ in biology
@ogMonty21 9 жыл бұрын
tru!
@sweetummi123 9 жыл бұрын
***** ikr..... i wish
@LehoainamNam216 9 жыл бұрын
Vc
@jennamontanaa 9 жыл бұрын
Hoainam Le gmfdv
@Kebinwmiles 9 жыл бұрын
***** seriously doubt you would get an "A ++++++++++++++++" since that is an absurd grading scale that a normal instructor wouldn't use. smh
@MdmERM 6 жыл бұрын
I come back to this video every few years when I find myself needing a reminder about this process. Thanks Hank
@nataliea7858 6 жыл бұрын
I’ve watched this so many times that it’s finally starting to make sense
@whatsinaname7289 7 жыл бұрын
6:50 John doing a mannequin challenge 4 years before it was a thing!!😂😂😂😂😂
@VyxtheBat 4 жыл бұрын
@@ZeeGhost713 WTFFFFFFF
@walkinginthesun17 9 жыл бұрын
I would have failed history and biology in college if it weren't for you guys! Thank youu so much! these videos are awesome and perfect for procrastinators like myself!
@KamixSam 9 жыл бұрын
I wasn't aware that my epic assassins creed skill came from genetics
@JulianLopezMasterRace 9 жыл бұрын
Samuel Sargunam Completely unrelated but... Clannad =
@KamixSam 9 жыл бұрын
Julian Lopez Clannad is amazing!
@nightravenalchemist 9 жыл бұрын
Samuel Sargunam Well apparently it does now.
@wenbenz 9 жыл бұрын
Samuel Sargunam He could be genetically predisposed to video games, which allows him to get better at video games faster.
@avishekdutta3310 5 жыл бұрын
Clannad Afterstory💕
@Tybeuf 8 жыл бұрын
Comment and like if you think Crash Course should do Physics
@hwaner1 8 жыл бұрын
Totally #Trump2016
@NehaPd 8 жыл бұрын
+Tyler Goodchild (tg228) Crash Course Physics is now available!
@marsboy12 5 жыл бұрын
Contagion Dwayne Johnson?
@angelojustinezaraspe9214 5 жыл бұрын
Yess
@anya2885 4 жыл бұрын
Yes
@eldjibheryr3546 4 жыл бұрын
i'm doing a summer semester online with no classroom interaction, just READ THIS CHAPTER AND LEARN IT. thank you, hank, for teaching me biology.
@stigfox 6 жыл бұрын
This entire channel is an amazing addition to text books and lectures! Amazing detailed overviews that really help organize everything in my brain-space. Much love and thanks for these videos!
@lakengross6777 8 жыл бұрын
Can you do Punnet Squares and Proababiltiy of Genetics/heredity?!?
@Nick-yg9ql 8 жыл бұрын
+Laken Gross they did it, in a video about DNA
@glennmatthews758 5 жыл бұрын
Punnet squares aren't that difficult to understand...
@riya3930 4 жыл бұрын
Watch their heredity video, they talked about it really distinctively
@Bobbiethejean 8 жыл бұрын
"I'm better at Assassin's Creed than he is..." Oh Hank, please. never change.
@Euphoricbryanna 7 жыл бұрын
lmfao. i wish this guy was my teacher. he's so funny
@chopinfrederic5040 4 жыл бұрын
My Bio teacher would beg to differ
@TheFlash9333 9 жыл бұрын
learned more in 11 minutes than what my bio teacher could do in 6 weeks
@matingood5723 4 жыл бұрын
do we love how john didn't blink at all during that 15 seconds.
@analiesengelsman63 5 жыл бұрын
Note to students: don’t cram 30 minutes before an exam! Not that I’m speaking from personal experience or anything....
@ArvoDes 9 жыл бұрын
This is probably the most useful channel on youtube, thank you so much
@idunnowhatimdoin 9 жыл бұрын
So when I eat popcorn, I'm basically swallowing plant sperm?
@andrewsugrue2170 9 жыл бұрын
idunnowhatimdoin Thanks for ruining the movies for me...
@isabellagill-gomez7745 9 жыл бұрын
idunnowhatimdoin if you're allergic to pollen then you're allergic to plant sperm
@ZipZapityZone 9 жыл бұрын
It is plant sperm!!!!!!
@Kebinwmiles 9 жыл бұрын
idunnowhatimdoin that's deep bro
@ShiNoKuroTsuki 10 жыл бұрын
You explain this much better and much more comprehensible than my teacher. And English isn't even my mother language...
@SorryIdrinkCoffee 10 жыл бұрын
same hier
@bugrajatt 4 жыл бұрын
I feel the weirdest deja vu watching this again for my upper division molecular genetics class. Feels like I'm in 10th grade AP biology again. 😅
@sweetsuger666 7 жыл бұрын
he makes biology sound good
@AeliaReadsBooks 10 жыл бұрын
this will come in handy for my bio exam thanks,Hank
@1999flowers 8 жыл бұрын
when you have a bio final tmrw and your internet connection is being a shthead frkng hate this. arghhhh
@Shyguy33Games 8 жыл бұрын
cringe
@noabsolutelynot3660 5 жыл бұрын
oOf
@ewongton8257 7 жыл бұрын
I have learned more and come to a better understanding of biology watching 5 episodes of crash course in comparison to 12 hours of school which had only left me clueless. Hank Green, you are seriously a student's lifesaver. Thank you.
@planetchickaboom 8 жыл бұрын
I'm so impressed with these crash course videos! I find them incredibly useful for bio english and history. S/O to whoever is funding these and making them publicly available
@guyu96 10 жыл бұрын
Hank you do the best "Aww Dude" on this planet!! 00:41
@a.j.digiovanni3489 9 жыл бұрын
Wow, in all my biology education through high school I was never informed that only one of the daughter cells of meiosis becomes an actual egg cell. Thanks for that tidbit, good sir!
@alexislanza5156 6 жыл бұрын
My biology teacher showed our class this channel my sophomore year of high school. Now im a freshman in college and i still watch this. It's so easy to learn from this!
@alyssavu1302 8 жыл бұрын
Shout out to the Assassin's Creed reference hahahah
@KaguraShinihimeMartinez 8 жыл бұрын
+Alyssa Vu Nothing is True
@danotheparsnip 8 жыл бұрын
Everything is permitted
@lordinfamous7665 8 жыл бұрын
Requiescat en pace
@jagjotsingh7129 8 жыл бұрын
+Alyssa Vu shout out to them getting me through genetics
@margot8525 7 жыл бұрын
That wasn't a reference lol
@user-kt7ni3dn1s 9 жыл бұрын
This is how im getting through the AP Bio exam lol
@TheEmmaporium 9 жыл бұрын
Влад Кузь SAAAAMMMMEEEEE
@hufflepuff487 9 жыл бұрын
Влад Кузь SAME
@RacsoNagem 9 жыл бұрын
Влад Кузь AP? This is my normal year 12 exam!
@Mmla19 9 жыл бұрын
Oscar Megan yeah, AP means advanced placement, meaning you can take this as a 9th grader
@user-kt7ni3dn1s 9 жыл бұрын
AP Bio as a 9th grader? My AP Bio teacher told me that she had one freshman take it but he dropped out after a month. Its just not something that your average 8th grade science class can prepare you for.
@SamtheSlushy 9 жыл бұрын
6:50 "john is stuck with this trash brown puff"
@anceeikena7284 6 жыл бұрын
THANK YOU THANK YOU THANK YOU!!!! I`m almost crying tears of joy, because something I used to watch just for fun now is very useful for studies AND FUN. Sending all my love to the people of Crash Course
@UniverseEarthSpirit 9 жыл бұрын
I have never been able to get over how amazing meiosis is. Great Video!
@kaynine9022 4 жыл бұрын
Can i just give you some appreciation for actually making me enjoy AND understand science. You have been saving my academic career for 7 months now.
@susied377 10 жыл бұрын
Thank God CrashCourse biology exist or i might fail my class. Honestly, all the visuals are awesome and its just way more interesting than a boring slide show and taking notes.
@mariahleigh2001 6 жыл бұрын
bless your soul, I was falling asleep watching a bunch of drawings on a black screen, you make this a lot more easier to pay attention to
@Jemdawg1000 8 жыл бұрын
I have a quiz on this tomorrow. Thank you for making it clear!!!
@A_A828 10 жыл бұрын
Damn it, even with CrashCourse I don't get this stuff. I'm in college studying psychology now, and thought I would look this stuff back up as I never got it completely in high school even though I really liked biology, but yeah... Everything is so mixed up and complicated when it comes to DNA replication/meiosis/mitosis, I just keep missing stuff and getting confused.
@patricksteele1161 10 жыл бұрын
Get out some flash cards, when ever he says something you don't know or understand, make a flash card for it and look up the definition. There is a lot of stuff, and it requires lots of reading, watching videos, and studying to get it down.
@A_A828 10 жыл бұрын
Thanks man, I'll give it a go
@ShashankParsewar 10 жыл бұрын
You could always try any exercises online
@mandycarter2559 10 жыл бұрын
Go to MasteringBiology for practive quizzes, activities, videos ...... I'm studying psychology too and it helps ;)
@lunamoonlune 10 жыл бұрын
It's really fast paced, but I found that taking out a notepad and writing notes, pausing the video, as he says the important info makes the whole video make a whole lot of sense! Then you just watch the video again and you understand everything he says.
@kikesemore7045 8 жыл бұрын
Wait, this guy isn't John Green? I THOUGHT HE WAS JOHN FOR THE LONGEST TIME.
@iffshahjaffery5432 8 жыл бұрын
This is his younger brother, Hank Green! XD
@tanyakorotiuk7176 8 жыл бұрын
dude, same here, i just found out a few weeks ago, when in one video i saw both of them...
@slinkkkcrown6061 8 жыл бұрын
Lol
@greennitricoxide2706 5 жыл бұрын
keep up
@kimvaughan2140 5 жыл бұрын
ha ha ha
@ganeshramg.s7715 7 жыл бұрын
cool videos . john is humorous in his way of expressing , making my interest in biology more.
@mmirandaaaax 7 жыл бұрын
You have finally inspired me after an entire semester of biology to be wowed by the processes inside of our body and cells. Thank you for bringing humour and logic to this complicated topic. Lets hope the exam goes well tomorrow ;)
@antredevers9490 7 жыл бұрын
Sir you have saved me this semester in my Biology course. Thanks so much for entertaining and understandable videos.
@GemPiece 10 жыл бұрын
of all the mitosis/meiosis videos on youtube, these are the only ones that keep my attention and make it so easy for me to understand. great job
@glennmatthews758 5 жыл бұрын
6:04 I love the way he says that, the inflection of his voice.
@ariannakraljic6237 4 жыл бұрын
The fact that he brings up Doctor Who in almost every video makes my day
@TotalNoobAtEverythin 7 жыл бұрын
I learn perfectly fine in class, I just like going over things once more with a different view/explanation. I love watching Crash Course videos about stuff I already know
@samanthataylor1761 7 жыл бұрын
"trash Brown puff" 😂 😂 😂 😂
@wild23oo 4 жыл бұрын
Right
@FreddyG687 7 жыл бұрын
LOVE the way this guy explain the process, Great Job Bud!
@dinosaurrawl6800 5 жыл бұрын
Thank you for always having CC!
@juzellloyd5081 8 жыл бұрын
These videos are so great. Hank's always funny and he makes the topic interesting. This really helps with exams. Thanks Crash Course!
@Bigbangrdbst 9 жыл бұрын
You should make a physics page
@JKchick62 9 жыл бұрын
Omg L :D...and yes I agree a physics page should be made.
@MrPerfectBob 9 жыл бұрын
***** thermodynamics is a part of physics.. are you high
@unite5870 9 жыл бұрын
Quantum mechanics is physics -_-
@LightninLi2ard 9 жыл бұрын
What are these comments XD
@Bigbangrdbst 9 жыл бұрын
i don teven remmber writing this -_-
@xuemi2079 8 жыл бұрын
you made it pretty easy nd interesting .. like im planning to watch all ur videos in the summer holiday !
@aaronohnemus3446 9 жыл бұрын
You, sir, have been instrumental in my understanding of biology. I would simply like to thank you!
@alexism5860 5 жыл бұрын
Going on 30+ hours of studying for SAT bio and mitosis/meiosis still always get me the animations are very cute btw
@Someone-sq8im 4 жыл бұрын
"My mad Assassin's Creed skills" That's a learned trait
@9dash 4 жыл бұрын
Bruh, its a joke.
@emmajoyce7445 8 жыл бұрын
Ahh, you are so helpful! I go to my lecture and I leave, after having just been told all this, knowing I'm going straight home to watch you! Thank you :)
@jrjon738 6 жыл бұрын
I'm still watching this in 2017! Thanks for the great work!
@marilynngrijalva4081 10 жыл бұрын
I just want to thank you for posting these videos. They are vivid, eye catching and never dull. They are a lot of help for my college course.
@trevorvoss5892 5 жыл бұрын
I'm a physicist who recently began work in the field of Bio-Medical Engineering. These videos have helped me SO MUCH. I cannot thank you enough.
@AdamBlogz 6 жыл бұрын
Thanks for the lovely introduction , went of full volume in library
@KathrinaMahabir 6 жыл бұрын
This helped me out so much, i can't thank you enough for these videos
@itaidagan1 8 жыл бұрын
It's really confusing when he says "there's your mother's version lined up right next to your father's version" when the entire process is happening in a single person, it almost sounds like it's happening in an embryo, and it's not.
@purpleagentpeanut9969 7 жыл бұрын
You have 23 pairs of cromosomes, half of those pairs are from your dad, the other from your mom
@katethegreat4918 6 жыл бұрын
Yeah, I was confused about that at first too
@yahiakhaled253 5 жыл бұрын
Ikr
@davidh3205 5 жыл бұрын
Dude I know this was 3 years ago but can you explain this? I cannot wrap my head around what he's saying - it doesn't add up logically
@momokokami2771 9 жыл бұрын
Why is this guy getting 122 dislikes... ._. ? Hes helping us and its explains it well. Why dislike?
@KaWulfe 6 жыл бұрын
this video is like 6 years old but oh my god bless you guys LIFE SAVERS
@husahallo 8 жыл бұрын
I teach chemistry/biology/physics in Norway. The book the school use can be pretty bad at explaining things like miosis in a good way. Their English skills are not good enough to understand this type of scholar English. So to make class more interesting and what they are learning easier to understand I use crash courses where I do a Norwegian voice over in class. They love it, and they really get it! Thank you so much for making awesome videos!
@yuven437 9 жыл бұрын
I have "finals" in biology on monday! So damned stressed out! Thank you crash course! can you do a series on math next? :D
@abcbassabc 9 жыл бұрын
atheistfromnorway AP Bio?
@yuven437 9 жыл бұрын
Kreeky ?
@abcbassabc 9 жыл бұрын
atheistfromnorway Just wondering if you were also in ap bio because that's when our ap test is.
@yuven437 9 жыл бұрын
well I doubt it, never heard of AP bio. I have "biology 1". What does AP mean?
@abcbassabc 9 жыл бұрын
atheistfromnorway Don't I look foolish. It's advanced placement: essentially, a high school course that teaches at a college level. If you pass the exam at the end of the year, you get college cred.
@senadonkor2228 8 жыл бұрын
Lol. Omg, you're Hank green? This legit just made my day and I was all like, "Did he say John? Wait, is that John Green?" OMGGGGGGGGGG. John Green is my favorite author
@theGuilherme36 8 жыл бұрын
+Sena Donkor Yeah haha, I also didn't know that (until some days ago)
@hayasulaiman6559 8 жыл бұрын
Thank you crash course! You guys know how to make it fun and interesting
@whiteeyedshadow8423 6 ай бұрын
bro coming back to this channel after a long time is amazing because its somehow even funnier than 12 year old me remembers it being great stuff
@lorenzosorrell1566 7 жыл бұрын
I'm studying this stuff for my next test
@maggieissecretlyaunicorn 8 жыл бұрын
this was a perfect review for my quiz tomorrow, thank you!
@maggier6719 8 жыл бұрын
hey you have the same name as me and i also have a quiz over this tomorrow, and im also in the phandom are you me did i just meet my clone
@maggieissecretlyaunicorn 8 жыл бұрын
maggie r i've always wanted a secret clone nice 😂
@Sara-yr4kk 7 жыл бұрын
bless your soul hank green you are helping me survive my degree. thank you, truly
@Beverlypen 7 жыл бұрын
My teacher doesn't even teach us in class he just makes us read the textbook, and the textbook is really hard to understand. I learn better by hearing it so I FINALLY understand after the 2 months of "learning" mitosis and meiosis.
@TropicalChris 10 жыл бұрын
You're better at Assassin's Creed? You mean you can press the X button faster than him during the cut scene? lol
@peterp-a-n4743 10 жыл бұрын
Really, how is it even possible to be bad at Assassin's Creed?
@danielcollison6161 10 жыл бұрын
Peter P-a-n Mashing the attack button and never blocking, not running into hiding places. NOT COLLECTING EVERYTHING!
@CatrinL 10 жыл бұрын
HOLY TARDIS ON GALLIFREY! OKAY, OKAY, YOU FRIKEN MENTIONED DOCTOR WHO AND I OFFICIALLY LOVE YOU FOR ALL OF YOUR REGENERATIONS! :D
@ComicAlien 10 жыл бұрын
***** Sigh...
@surlysmiles 10 жыл бұрын
creepy fangirl
@TDeclinator 10 жыл бұрын
You a creepy nigga!
@CatrinL 10 жыл бұрын
I'm sorry you don't understand my happiness. Doctor Who brings me so much joy, sadness, and a new appreciation for everyday life. I apologize for your lack of knowledge about Doctor Who.
@TDeclinator 10 жыл бұрын
Actually i watch doctor who, and for your information, im the same as you.
@rachelhuang_sdg 8 жыл бұрын
You are a wonderful lecturer!!!! Fantastic! Many thanks and please keep producing high quality videos like this❤️
@wild23oo 4 жыл бұрын
V beautiful can you watch me in my channel 😊😊😊😊
@eleonorandersson1824 7 жыл бұрын
I friken love crash course. I have a bio exam in two day and will be watching crash course that whole time.
@katherinewojcik 8 жыл бұрын
I LOVE this. Thank you for 'speaking my language'. Your videos are so helpful! Three chapters of my textbook didn't help me as much as these videos. Keep doin' what your doin'. It is much appreciated!
@thomash3949 9 жыл бұрын
You are saving an IB student right now
@kimicub7712 4 жыл бұрын
I've been watching the Crash Course A&P series to understand my class, and my professor posted this video for lecture this week! He looks sooo much younger here hahaha I love him :)
@damanstar 8 жыл бұрын
You legit get me through year 12 biology
@thoughtsfromahead 9 жыл бұрын
I think I may have found a pretty notable mistake (This is genuine confusion & care, because I'm in an intro college bio course right now, and I just used this video to fully understand how meiosis works and it is a source of variation in sexually reproducing organisms). At 8:44, Hank says "That is the end of [Meiosis I]. We now have 2 haploid cells, each with 23 double chromosomes..." Wouldn't that make them diploid? The cells aren't haploid until they have split again, at the end of Meiosis II. I could be wrong, or you guys could be using haploid to mean something else. Just thought I'd weigh in.
@utvota 9 жыл бұрын
As long as they remain attached at the centromere they are considered to be one chromosome and therefore they are Haploid.
@thoughtsfromahead 9 жыл бұрын
But the definition of "haploid," when referring to haploid/diploid and not a "haploid number," is one copy of all the genetic information needed instead of two. Even if they are attached at the centromere, it's two copies of the info
@thoughtsfromahead 9 жыл бұрын
Right before meiosis II, the cells are technically tetraploid. Then, they are diploid. Then, they are haploid.
@utvota 9 жыл бұрын
thoughtsfromahead The ploidy refers to the number of chromosomes not chromatids. Until the chromatids separate they are considered to be one chromosome. So even if they have copied themselves the chromosomes are not considered to be diploid until after they are separated at the centromere.
@thoughtsfromahead 9 жыл бұрын
utvota Ah, that makes sense. The technical definitions of chromosomes and chromatids can get tricky! Diploidy then would mean two copies of the DNA as separate chromosomes. Not a mistake then!
@Galdeater 7 жыл бұрын
Good luck for Friday guys
@farsan_ani_churmure 5 жыл бұрын
At 7:00 I honestly expected John to punch Hank in the face LOL
@alexblue5625 6 жыл бұрын
Thank you soo much your videos really helped me so much Everyone who wants to learn i tell them to watch you hands down the best learning channel on the internet :D
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