Lecture15-slides - 1 Why sex exists is a major UNsolved problem in evolutionary biology 2 Sexuality = Reproduction that involves creating new

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Unformatted text preview: 10/6/09 1 Why sex exists is a major, UNsolved problem in evolutionary biology 10/6/09 2 Sexuality = Reproduction that involves creating new genetic combinations- Transfer of genetic material- Crossing over Asexuality = Reproduction without creating new genetic combinations (aka: Parthenogenesis) Sexual Asexual 10/6/09 2 Sexuality = Reproduction that involves creating new genetic combinations- Transfer of genetic material- Crossing over Asexuality = Reproduction without creating new genetic combinations (aka: Parthenogenesis) Sexual Asexual Costs of Sex: The Cost of Making Males 10/6/09 3 The Cost of Making Males Asexual reproduction Sexual reproduction 1 10 100 1000 10000 100000 1 2 3 4 5 6 7 8 9 10 Population Size (log scale) Asexuals Sexuals Second descendants The Cost of Meiosis Initial Parents First descendants 10/6/09 4 Additional Costs of Sexual Reproduction: Sexually Transmitted Diseases U.S. (2006) STDs in Sierra-dome Spiders reduce egg-hatching success 10/6/09 5 Additional Costs of Sexual Reproduction:...
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This note was uploaded on 12/25/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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Lecture15-slides - 1 Why sex exists is a major UNsolved problem in evolutionary biology 2 Sexuality = Reproduction that involves creating new

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