Anthro_L6

Anthro_L6 - Fire Code Yeah We need you to actually be in a...

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Fire Code • Yeah… • We need you to actually be in a seat.
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Special Topics in Genetics • Recap • Homosexuality in women • Facultative versus obligate traits • Polygenic traits • Outside the basics of dominant-recessive • Sexual repro versus asexual repro 22
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Clicker Question 33
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Recap • Recombination results in unique gametes • Recombination provides a selective pressure for fixation of critical genes • Heritability measures the amount of differences in a trait within a population due to differences in genes. • The effects of any allele on the X chromosome will be seen in men’s phenotype 44 Late people: please sit in a seat, it's fire code.
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Male Homosexuality • Women who have the male homosexuality allele have greater reproductive success. • But NOT twice as many kids as normal – They are not taking up the slack for homosexual brothers – They don’t need to for the allele to be favored – Function of being an allele on the X chromo. 55 Late people: please sit in a seat, it’s fire code.
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Male Homosexuality • Because women have twice as many X chromosomes, • an allele on the X chromosome will be in a woman twice as often as in a man. • Therefore, for the female benefit to outweigh the male cost, • the benefit must be greater than half the cost, • allowing the allele to be favored at the 66
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Male Homosexuality Benefits in Women Costs in Men . XX XY .5 per X .5 + .5 1.0 1.0 per X = .5+ per X 1.0 per X .5+ + .5+ 1.0 > 77
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Male Homosexuality Benefits in Women Costs in Men . XX XY 1.0 Total benefits outweigh total costs at population level, therefore the allele is favored .5+ per X 1.0 per X .5+ + .5+ > 88
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Female Homosexuality • Less is known about female homosexuality • Theoretically not as interesting? • Socially not as important? • Harder to get a hold of? 99 Late people: please sit in a seat, it's fire code.
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Female Homosexuality • How do you measure homosexuality? 1010
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Female Homosexuality • No solid evidence for genetic basis of female homosexuality • No birth order effects for female homosexuality 1111
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Female Homosexuality • Female sexuality is more dynamic than male sexuality • Changes with – Age – Education 1212
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• Many traits are affected by the environment. • Female sexuality is affected by age • Height is affected by malnutrition • But some traits require environmental input to function properly. 1313
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Anthro_L6 - Fire Code Yeah We need you to actually be in a...

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