Feb 10 handout - 2/10/2012 The Paradox of Sex What is it?...

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2/10/2012 1 The Paradox of Sex • What is it? • Costs versus benefits of sexual reproduction • Sex and variation • Variation and adaptability • Adaptability and selection The Cost • Context: compare parthenogenesis with sexual reproduction –Parthenogenesis is a form of reproduction in which an unfertilized egg develops into a new adult individual. • Relatively common among insects. –Sexual reproduction is the formation of a new individual following the union of two gametes The Two-Fold Cost of Sex • The first cost – Sexually reproducing females produce offspring that (on average) share 50% of their genome. – Parthenogenetic females produce offspring that share 100% of their genome.
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2/10/2012 2 The Two-Fold Cost of Sex • The second cost – Sexually reproducing females produce males as well as females; only some of their offspring can bear young – Parthenogenetic females produce only females (sometimes); all of their offspring can bear young Other Costs • Recombination scrambles genotypes, disrupting favorably adapted gene combinations • Meiosis and syngamy takes longer than mitosis • Courtship and mating may be risky, because of the risk from predation or even sexually transmitted disease
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This note was uploaded on 03/21/2012 for the course ENTOMOLOGY 104 taught by Professor Lewis during the Spring '12 term at UC Davis.

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Feb 10 handout - 2/10/2012 The Paradox of Sex What is it?...

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