GENE EXPRESSION & CANCER - AQA A LEVEL BIOLOGY + EXAM QUESTIONS RUN THROUGH

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In this video, I explain ALL of the content required for the "Gene expression and cancer" section for AQA A Level Biology. This includes: what is cancer, characteristics of benign + malignant tumours, tumour suppressor genes, oncogenes, and the effect of increased oestrogen concentration on breast cancer risk. Time stamps are in the comments.
I also go through a few exam questions and explain their mark schemes.
The content in this video crosses over with other exam boards too.
Please leave a comment if you have any questions, I'll be more than happy to answer them!!! :)

Пікірлер: 15

@AlevelBiologyHelp 3 жыл бұрын

00:55 = What is cancer? 01:44 = Characteristics of benign tumours 03:12 = Characteristics of malignant tumours 04:29 = Oncogene action/regulation 05:29 = Tumour suppressor gene action/regulation 07:01 = How increased concentrations of oestrogen can increase breast cancer risk 08:19 = Exam questions and mark schemes

@user-kl5ug8js9z Ай бұрын

Thank you so much for your help - your style of videos are really helpful!

@SH-bt3rw 3 жыл бұрын

Thank you so much for this video, it was really helpful !

@arjunahkulendran291 2 жыл бұрын

Hi, is all this information enough for me to do exam questions based on gene expression. As well as, are the definitions AQA based or did you make it yourself>

@AlevelBiologyHelp 2 жыл бұрын

Yes, this is all the information you'll need and the definitions are based on the AQA specification so they will be accepted in an exam!

@RAHMANISHMIL 2 жыл бұрын

Thank you

@Mozzie7920 3 жыл бұрын

So on oncogenes it says that it leads to increased expression as chromatin is less condensed but on tumour suppressor genes it says it will lead to increased expression as chromatin is more condensed? Aren’t they contradicting one another?

@AlevelBiologyHelp 3 жыл бұрын

Hi! So in the video, I didn't mean that the TSG gene is more expressed , I meant that more tumours are expressed because the expression of the tumour suppressor gene (which normally limits tumour formation) is reduced. Hope this makes sense! :)

@Mozzie7920 3 жыл бұрын

@@AlevelBiologyHelp so would it be right to say that hypermethylation decreases expression of tumour suppressor genes, which leads to an increased expressions of tumours?

@AlevelBiologyHelp 3 жыл бұрын

@@Mozzie7920 It would probably be better to just say it leads to a higher tumour formation :)

@Mozzie7920 3 жыл бұрын

@@AlevelBiologyHelp okay thanks for the help