Question

1. In a population of flour beetles with 1,000 individuals, 483 of the population are black. In this species, red (R) is the dominant trait while black (r) is the recessive trait.

1. What are the allele frequencies of the recessive and the dominant allele?

2. What are the genotypic frequencies of homozygous recessive, homozygous dominant and heterozygous individuals?

3. How many individuals of the population are homozygous dominant for the trait?

4. What is the frequency of the dominant allele?

Answer 1

Ans- 1.) black beetles population = 483. Total population = 1000. q 2 = 483/1000. q = 0.69. (allele frequency of recessive allele)

* Considering the population in HWE. Therefore. (p+ q) 2  = 1.     Taking square root on both sides.     p + q = 1. Therefore   p = 1- q p = 1- 0.69 = 0.31 (allele frequency of dominant allele) .

a.) Genotypic frequency of Homozygous recessive = q 2 * Total population. = (0.69) 2  *  1000 = 476.1.

* Genotypic Frequency of Honozygous dominant = p2  * 1000. = (0.31)2  * 1000 = 96.1    * Genotypic  Frequency of hetreozygous =   2 p q * Total = 2 * 0.69 * 0.31 * 1000 = 427.8

a.) Individuals homozygous dominant for the trait = 96

a.) frequency of dominant allele = 0.31