BIOL 121 Lecture Notes - Irish Elk, Reproductive Isolation, Monophyly

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30 Dec 2012
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BIOL 121 Full Course Notes
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BIOL 121 Full Course Notes
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Two important consequences of the fundamental asymmetry of sex. Traits with a mating advantage, leading to differential mating success. Individuals have heritable traits that enhance their ability to obtain mates. Traits that attract members of the opposite sex are much more highly elaborated in males (sexual selection acts more strongly on males) Therefore, females invest much more in their offspring than do males. Two important consequences: eggs are large and energetically expensive and thus females produce relatively few young during lifetime. For males, fitness is limited not by the ability to acquire the resources needed to produce sperm, but by the number of females they can mate with. The number of mates that produce offspring over a period of time. Ensure that genes are passed on to offspring. Prevent inbreeding resurgence of homozygous recessive alleles. Refers to any trait that differs between males and females (size, weapons males use to fight over females, elaborate ornamentation/behaviour, etc)

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