CHDV 23249 Lecture Notes - Lecture 6: Zebra Shark, Anisogamy, Haplodiploidy
23 Jan 2017
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Document Summary
Why not asexual reproduction? lots of organisms that do. Passing on 100% genes to the next generation. Fragmentation: planaria (if you cut a planaria in half, it generates into 2 planaria) Regeneration: sea stars (if you cut off an arm, arm will grow back) Whiptail: female hybrids. males don"t make it to the reproductive stage. Embryos are 100% mom"s genes there are courtship behaviors between females, but there is no exchange of gametes between the two. This behavior stimulates the formation of embryos: asexual reproduction without fertilization, obligate v. facultative. You still have mutations in asexual reproduction, but very small/nonimpactful. Cost of meiosis transfer 100% genes, keeping beneficial genes. Cost of producing males: wasted sperm (a lot of these gametes aren"t used. Energy to produce this could have been used for something else. Only one sperm fertilizes the egg out of hundreds)
