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Unformatted text preview: Trait 1 Pku Trait 2 albinism pp mm Cross: no pku, no albinism x pku, albino Genotypes: PP MM x pp mm Gamete: PM pm F1 offspring? PpMm Gametes? PM Pm pM pm The dihybrid punnett square Take home message 2: The allele you pass on for one trait has no effect on which allele you pass on for some other trait (independent assortment) Q: if an individual shows the dominant phenotype, how can you determine their genotype? Take home message 3: The test cross allows you to determine whether inds showing the dominant trait are homozygous or heterozygous Sex determination How is the sex of a baby determined by the father? Q: if men only have one x chromosome, are they more or less likely to exhibit a sex link a sex-linked recessive trait? What about dominant? Take home message 4: Sex linked traits have different patterns of expression in males and females...
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- Fall '07