Anthro 7 Practice MT 1 - (1 According to Darwin's theory...

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(1) According to Darwin’s theory, what three conditions must occur in order for natural selection to occur? Describe each condition in a phrase or a complete sentence, not a single word. More offspring are produced than can survive. Organisms within populations vary, and this variation affects their ability to survive and reproduce. Variation is heritable, i.e. offspring tend to resemble their parents. (2) At the locus that controls ABO blood group in humans, there are three alleles: A , B and O . The O allele is recessive to both A and B , but A and B are co-dominant with each other. This means that heterozygous AO individuals have the phenotype A , heterozygous BO individuals have the phenotype B , and heterozygous AB individuals have the phenotype AB . Suppose that an AB individual mates with an AO individual. What would be the resulting genotypic and phenotypic ratios among their offspring? Show your work. Genotypic: 1:1:1:1 AA:AB:OA:OB Phenotypic: 2:1:1 A:AB:B (3) Consider a locus in a hypothetical population of 1000 individuals. There are two alleles at this locus, A and a .. The frequency of the A allele is 0.84. Assuming random mating, what will the genotype frequencies be in the zygotes produced by this population? AA: (.84) 2 = .7056 or 706/1000 Aa: (2)(.84)(.16) = .2688 or 269/1000 aa: (.16) 2 = .0256 or 26/1000 Suppose that 50% of the AA and aa zygotes survive to adulthood, whereas all of the Aa zygotes survive to adulthood. What will the genotype frequencies be in the adults that grow from these zygotes?
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