The value of Q is 0.44 if 20 organisms of 100 organisms are green.
Explanation:
Data given:
alleles for the color of eyes of fly:
blue allele = dominant represented by P
green allele = recessive, represented by Q
total number of organism = 100
number of recessive trait organism, = 20
Q =?
The allele frequency of the green eye is calculated as:
=
= 0.2
q =
q = 0.44
0.44 is the frequency of Q allele in the population.
Q is the homozygous recessive alleles in the population and its value is 0.44.