BIO318Y5 Lecture 7: 2nd half Lecture 7

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14 May 2011
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Mate choice and levels of selection: goods or services -> females want for direct benefits, good genes -> good for the offspring superior quality compatibility -> no inbreeding. Runaway issues-> not want male to run away: females being duped (sensory exploitation) Males and females evolve together through sexual selection even though it hurts the females. As increase body length, the eye stalk length also increases but does so for males more strongly than females. Can get a female only clutch, but rare to get a male only clutch! Get female only clutch with long eye stalk only! But ration should be 1:1 because it is adaptive to make the rarer sex! Females do not mate with the shorter eye males because they are more likely to carry the selfish genetic element on their x chromosome which kills the y chromosome during meiosis resulting in female only offspring!

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