In humans the presence of chin and cheek dimples is dominant to t...

Question

In humans the presence of chin and cheek dimples is dominant to the absence of dimples, and the ability to taste the compound PTC is dominant to the inability to taste the compound. Both traits are autosomal, and they are unlinked. The frequencies of alleles for dimples are D = 0.62 and d = 0.38. For tasting, the allele frequencies are T = 0.76 and t = 0.24.

Determine the frequency of genotypes for each gene and the frequency of each phenotype.

Accepted Answer

Hello everyone and welcome to today's video. So the frequency of a dominant allele for a particular trait is 0.7. While that of a recessive allele is going to be 0.2, assuming Hardy Weinberg equilibrium determine the genotype frequency of the heterozygous. So as answer choice A, we have 0.4 as answer choice B we have 0.12 as answer choice C we have 0.28. And as answer choice D we have 0.49. We recall from previous videos, what the Hardy Weinberg equation is going to be and this is going to be P square plus two P Q plus Q square equals one. Now we are asked in this question to determine the genotype frequency of these heterozygosis heterozygote are going to be represented by two times P times Q. So if we want to determine their frequency, we just need to determine this value here. Now two times P, this P is going to be the allele frequency of the dominant allele, which is stated to be 0.7. While Q is going to be the allele frequency for the recessive allele, which is stated to be 0.2. So this is the multiplication that we're going to be doing. And if we multiply these, we're going to obtain that the geno type frequency for heteros is going to be 0.28 when we highlight this and we look at our answer choices, we can see that the correct answer for this question is going to be C 0.28. I really hope this helped you and I hope to see you on the next one.

My Courses

Chemistry

Biology

Math

Physics

Business

Social Sciences

Programming

Product & Marketing