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11 Nov 2019
3. Imagine that you have two neighboring populations (1 and 2) of a species. There is random mating within each population, so they are each in Hardy-Weinberg equilibrium for a locus with two alleles (A and a. In population 1, the frequency of the âAâ allele is p -09. In population 2, the frequency of the âA" allele is p-03. Imagine that you generate a mixed population consisting of half individuals from population 1 and half individuals from population 2. Assuming no mating or reproduction has yet occurred in the mixed population, what are the allele and genotype frequencies in the mixed population? [Show calculations that justify your answer, but you do not need to provide a written explanation.] a. b. Is the mixed population in Hardy-Weinberg equilibrium (i.e., immediately after mixing but before any mating has occurred)? If not, is there an overrepresentation or underrepresentation of heterozygotes in the population relative to Hardy Weinberg expectations? [Show calculations that iustify your answer, but you do not need to provide a written explanation.] For part (b), you should have found that the population is not in Hardy-Weinberg equilibrium. This is an illustration of what is known as the Wahlund Effect, in which an overall (mixed) population can deviate from Hardy-Weinberg equilibrium if there are isolated subpopulations with different allele frequencies (even if each individual subpopulation is in Hardy-Weinberg equilibrium itself) Briefly explain why the presence of isolated subpopulations within a population can have similar effects on genotype frequencies as inbreeding among close relatives within a population c. d. Now imagine that the mixed population that you generated starts undergoing random mating. How many generations should it take for genotype frequencies to return to Hardy-Weinberg expectations? Briefly explain why.
3. Imagine that you have two neighboring populations (1 and 2) of a species. There is random mating within each population, so they are each in Hardy-Weinberg equilibrium for a locus with two alleles (A and a. In population 1, the frequency of the âAâ allele is p -09. In population 2, the frequency of the âA" allele is p-03. Imagine that you generate a mixed population consisting of half individuals from population 1 and half individuals from population 2. Assuming no mating or reproduction has yet occurred in the mixed population, what are the allele and genotype frequencies in the mixed population? [Show calculations that justify your answer, but you do not need to provide a written explanation.] a. b. Is the mixed population in Hardy-Weinberg equilibrium (i.e., immediately after mixing but before any mating has occurred)? If not, is there an overrepresentation or underrepresentation of heterozygotes in the population relative to Hardy Weinberg expectations? [Show calculations that iustify your answer, but you do not need to provide a written explanation.] For part (b), you should have found that the population is not in Hardy-Weinberg equilibrium. This is an illustration of what is known as the Wahlund Effect, in which an overall (mixed) population can deviate from Hardy-Weinberg equilibrium if there are isolated subpopulations with different allele frequencies (even if each individual subpopulation is in Hardy-Weinberg equilibrium itself) Briefly explain why the presence of isolated subpopulations within a population can have similar effects on genotype frequencies as inbreeding among close relatives within a population c. d. Now imagine that the mixed population that you generated starts undergoing random mating. How many generations should it take for genotype frequencies to return to Hardy-Weinberg expectations? Briefly explain why.
Jamar FerryLv2
11 Jun 2019