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Ch 50 Notes - pg 996-999 chpt 50 sex sel SEXUAL SELECTION...

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pg 996-999 chpt 50 sex sel SEXUAL SELECTION 11. Define sexual selection, and describe different types of mating systems and approaches to parental care. *an animal’s reproductive success is a measure of its direct fitness sexual selection - a type of natural selection; occurs when individuals vary in their ability to compete for mates. occurs when one has an advantage over the same sex and species Animals seek quality mates *dominate males copulate with females who are in estrus , their fertile period *ornamentation signals good genes lek - small display area for male bats and insects and birds, where they compete for females; often position in lek determines if female will mate with male; courtship rituals -ensure that the male is indeed a male and is a member of the same species; can signal to trigger nest building or ovulation; do function as reproductive isolating mechanisms among species Sexual selection favors polygynous mating systems polygyny -
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