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Meiosis | Dr Najeeb
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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
(0:00-2:45)
Definition & Outline: Gametogenesis; Oogenesis & Spermatogenesis; Meiosis & Cytodifferentiation.
(2:47-10:00)
Meiosis in detail: Diploid Early Germ Cells; 23 homologous chromosomes from each parent; defining homologous chromosomes; genes & alleles.
(10:01-13:15)
DNA replication; duplication of chromosomes; chromatids.
(13:17-18:15)
Meiotic division; Spermatogonia & Oogonia; haploid(1n) & diploid(2n); difference b/w "n" and "N".
(18:16-24:25)
Formation of double structured/diploid Primary Gamete: Primary Oocyte(2n) & Primary Spermatocyte(2n).
Short recap.
(24:30-29:30)
Major difference between Meiosis I and Mitosis: Pairing of homologous maternal & homologous paternal chromosomes: (1) Synapsis.
(29:31-34:59)
(2) Cross Over; Exchange of blocks of genes b/w homologous chromosomes from each parent.
(3) Chiasma; unique/recombinant genetic material.
(35:00-40:40)
Alignment; followed by Disjunction; random allocation into daughter cells;
Creation of 2 Secondary Gametes.
(40:41-46:45)
Double structured homologous chromosomes (2N).
Meiosis II: splitting of centromere; end of Meiosis II.
Final result: 4 Haploid single structured (1N) chromosome.
(46:47-51:51)
Recap. Difference of second meiotic division (Meiosis II) b/w males & females.
Purpose of Meiosis; genetic diversity.
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