A total of 1000 members of a Central American population are type...

Question

A total of 1000 members of a Central American population are typed for the ABO blood group. In the sample, 421 have blood type A, 168 have blood type B, 336 have blood type O, and 75 have blood type AB. Use this information to determine the frequency of ABO blood group alleles in the sample.

Accepted Answer

Hello, everyone and welcome to today's video. So cystic fibrosis occurs at a rate of one in 10,000 in an isolated population. Assuming the Hardy Weinberg principle, calculate the frequency of the recessive allele as answer choice A we have 0.1 as answer choice B we have 0.1 as answer choice C we have 0.1. And as answer choice D we have 0.1. Now we need to understand before we jump into this problem that cystic fibrosis is going to be a recessive deceased. So when an individual is one in 10,000 individual, this is going to be giving us the frequency of the homo cys recessive genotype in the population because the only way that an individual can have cystic fibrosis is if they are homo cycles recessive. So according to the Hardy Weinberg equation, this Q squared is going to be giving us the frequency of the homo cycles recessive, which we stated that it is going to be this one in 10,000. So Q squared is going to be equal to one in 10,000. Now we are asked in the problem to calculate the frequency of the recessive allele, not the homozygosis recessive genotype. So in order to calculate the recessive allele, we need to look for Q, not for Q square. So all we have to do is find the square root of each of the sides of the equation in order to obtain Q. And once we do that, we obtain that Q is equal to 0.1. So the correct answer for this question is going to be answer choice 80.1. I really hope this helped you and I hope to see you on the next video.

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A total of 1000 members of a Central American population are typed for the ABO blood group. In the sample, 421 have blood type A, 168 have blood type B, 336 have blood type O, and 75 have blood type AB. Use this information to determine the frequency of ABO blood group alleles in the sample.