Lecture 12 - BIO220

Population y use genetic markers to understand the

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Unformatted text preview: rs only in half the population (Y) – Use genetic markers to understand the evolutionary process – Use data about behavior and ecology to understand patterns in genetic data • Areas of low recombination will be inherited as a unit, while recombination will break up areas of high recombination to be inherited independently 7 8 -We can take advantage of our knowledge about how genes are t ransmitted in order to help us understand history 2 25/02/2013 Observations: Elephants have a fluid social system Question: Do male elephants avoid inbreeding? • Females often live with their natal group, with 2 20 maternal kin. These groups are composed of females and juveniles. • Hypothesis 1: Yes, male elephants have evolved inbreeding avoidance because inbreeding depression is severe • Males leave their natal groups at adolescence, but do not join other social groups. • Males are attracted to females in estrous, and can be seen with their natal group. • Hypothesis 2: Selection has not led to inbreeding avoidance because inbreeding depression is weak and/or male reproductive success is so highly variable • Male reproductive lifespan is long, and many males are still reproductive when their daughters mature. Female elephant kin group Female elephant kin group Male elephants fighting Male elephants fighting 9 -Males are booted out! They are only attracted to women in e strus -Can they avoid mating with their sisters/mom? -Elephants reproduce for a long time, they must be able to avoid m ating daughters once they mature (the fathers will still be at m ating age by the time their own daughters reac...
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