Biology 1001A Lecture 15: BIOLOGY LECTURE 15.docx

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jadebeaver77

15 May 2012

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Parasites place negative frequency-dependent selection on host genotypes. Sex (producing diversity of offspring genotypes) favored in parasite-rich environments (red. Queen hypothesis- running as fast as you can just to stay in one place) Summary: sex is costly and inefficient but incredibly successful. Short term advantage: hedge bets against a quickly changing environment (especially co-evolving parasites) Explains sexually dimorphic traits, and traits seemingly incompatible with natural selection. Many of these sexual dimorphic traits have no survivorship advantage, they are purely for attracting the opposite sex for mating purposes. Intrasexual: competition between members of the same sex. Intersexual: make the possessor of the trait very attractive to the opposite sex. Q: an attractive stranger makes you an offer: i"ve seen you around campus and find you very cute. It is usually the males than have to fight for the attention of females. Males have a larger number of gametes, which are small, and mobile. Women have a limited number of eggs.

Related Questions

2. Phenotypic dimorphism in which some large male beetles havelarge horns and other males are small and lack horns is thought tobe an example of which of the following? Select ALL correctanswers. A. positive assortative mating B. intersexual selection C.intrasexual selection D. negative assortative mating E. runawayselection

maroonhound724

1. The extravagant tail feathers of male peacocks are thought tobe an example of which of the following? Select ALL correctanswers.

	A.	positive assortative mating
	B.	intersexual selection
	C.	intrasexual selection
	D.	negative assortative mating
	E.	runaway selection

2. Phenotypic dimorphism in which some large male beetles havelarge horns and other males are small and lack horns is thought tobe an example of which of the following? Select ALL correctanswers.

	A.	positive assortative mating
	B.	intersexual selection
	C.	intrasexual selection
	D.	negative assortative mating
	E.	runaway selection

I have an idea of what the answer is but I don't want to missone. Thank you.

cerisewhale454

Which of the following is a true statement concerning sexual selection?

a. Showy secondary sexual characterstics can not be explained by natural selectin.

b. In most vertebrates, females court the males.

c. sexual selection can result in sexual dimorphism

d. intersexual selection leads to the death of many males in combat with other males

e. There is no evidence that intersexual selection takes place between females.

Biology 1001A Lecture 15: BIOLOGY LECTURE 15.docx

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