Question

For human blood, there are two alleles (called R and r) and the frequencies of these alleles in a population of 1000 individuals were 0.3 for R and 0.7 for r. What is the expected frequencies and number of individuals with the genotypes RR, Rr and rr?

Answer 1

Answer.

Allelic frequency is calculated as=Number of individuals of R(X) /total number of individuals

So, here we need to calculate X= 1000X0.3=300 individuals

For small r,

X=0.7X1000=700 individuals

R=300 individuals and r=700 individuals

RR= 0.3X0.3= 0.09

Rr= 0.3X0.7= 0.21

rr= 0.7X0.7=0.49

If the population is in HW equilibrium, then

p=dominant allele and q is the recessive allele

p^2+2pq+q^2=1

0.09+2X0.21+0.49=1

Means,the population is in HW equilibrium.