Biology 3475A/B Lecture : Ch 6.docx

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Polygamy: polygyny (males mate with many females) & polyandry (female mates with many males) How do they use pheromones to make a choice; how does the choosee use chemicals to be chosen. The one that invests the most in reproduction. Usually the female bc egg is larger than the sperm (sperm is cheap; eggs are a much greater investment) Females are the choosy sex and will reject unacceptable males sexual selection is not static it will change with age, life expectancy, and reproductive expectancy. Older ones: older males or poor quality males are better than no males at all. Bigger, more symmetric horns of a beetle is more attractive to females. Peacock beats other males trying to drive off competition. More mates = more progeny = more genes are present in popln. Lifetime # of matings vs. total # of offspring (positive relationship - Clear: more matings = more progeny = more genes passed on to next gen.

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