Figure 20.6 illustrates the effect of an ethanol-rich and an etha...

Question

Figure 20.6 illustrates the effect of an ethanol-rich and an ethanol-free environment on the frequency of the Drosophila allele in four populations in a 50-generation laboratory experiment. Population 1 and population 2 were reared for 50 generations in a high-ethanol environment, while control 1 and control 2 populations were reared for 50 generations in a zero-ethanol environment. Describe the effect of each environment on the populations, and state any conclusions you can reach about the role of any of the evolutionary processes in producing these effects.

Accepted Answer

Hey, everyone. Let's take a look at this question together, calculate the frequency of heterozygote in a random mating population at equilibrium. If the frequency of the dominant allele is 0.3 and the frequency of a recessive allele is 0.7, is it answer choice? A 0.32 answer choice B 0. answer choice C 0.42 or answer choice D 0.52. Let's work this problem out together to try to figure out which of the following answer choices is the frequency of heterozygote in this population. So since this population is at equilibrium, we know that it is following Hardy Weinberg equilibrium, which we can recall that the Hardy Weinberg equilibrium equation is P squared plus two P Q plus Q squared is equal to one. And from this equation, we know that P represents the frequency of the dominant allele Q represents the frequency of the recessive allele and two P Q is that frequency of the heterozygous genotype. And since the frequency of the dominant allele A is 0.3 and the frequency of the recessive allele is 0.7, we note that the value of P is 0.3 and the value of Q is 0.7. So that means that two P Q which is the frequency of the heterozygous genotype is two multiplied by 0.3, multiplied by 0.7, which equals 0.42 as that frequency of the heterozygote in this population. So answer choice C 0.42 is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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