Given the following information, how would you determine the allele frequencies for the B allele and the b allele? How would you determine the genotype frequencies for the BB, Bb, and bb genotypes?

Question

In a population of 200 students, 98 are homozygous dominant for brown hair (BB), 84 are heterozygous (Bb), and 18 are homozygous recessive (bb).

William Albracht · Accepted Answer

Please read this to understand.

Determine the frequency in 100 individuals when the number of individuals has already been mentioned. The frequency for this question will be as follows: Number of homozygous dominant 49% ( #B^2#) Number of heterozygous dominant 42% ( #2Bb#) Number of homozygous recessive 9% (#b^2#) (Alleles B and b are the two present.) At this point, you can determine the allele frequency: Frequency of allele B = #sqrt(.49)# = .7 Frequency of allele b = #sqrt(.9)# = .3 (The Hardy-Weinberg principle states that the total of all allele frequencies equals 1, so in this instance,.7 +.3 = 1).

Hudson Ansley · Answer

undefined To determine allele frequencies, count the total number of alleles present in the population. Then, divide the count of each allele by the total number of alleles.

To determine genotype frequencies, count the number of individuals with each genotype. Then, divide the count of each genotype by the total number of individuals in the population.