FGSS 2140 Lecture Notes - Lecture 4: Viviparity, Ovoviviparity, Female Sperm Storage
2 Sep 2016
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Suggested reading: chapter 1 in jones & lopez and start chapter 4 (male reproductive system) The evolution of sex: sexual vs. asexual reproduction. 1. asexual reproduction: advantages and disadvantages: d: lack of genetic diversity. But some species have found a a way to get around this: bacteria- conjugation: bacteria come together/ yeast produces asexually and sexually. 1. gives the chance for genetic diversity, randomly assorting chromo- somes. 1. (2^n)^2 (in humans, 2^23, so you can see that there are many chromosomes) crossing over: dna is exchanged between non-sister chro- matids disadvantages. 4. parent cell undergoes two divisions (m1 & m2) but only one replica- tion of chromatin. During m1, no separation of sister chromatids, but instead separation of in which daughter cell. In m2, the sister chromatids pull apart and we end up with four daughter cells. diploid > haploid four stages of meiosis i.
