Evolution Question 110
110. A gene locus has two alleles $A$, a. If the frequency of dominant allele $A$ is 0.4 , then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ?
(a) $0.36(AA) ; 0.48(Aa) ; 0.16(aa)$
(b) $0.16(AA) ; 0.24(Aa) ; 0.36(aa)$
(c) $0.16(AA) ; 0.48(Aa) ; 0.36(aa)$
(d) $0.16(AA) ; 0.36(Aa) ; 0.48(aa)$
Show Answer
Answer : c
Hints & Solution
(c) Frequency of dominant allele (p) $=0.4$
Frequency of recessive allele $(q)=1-0.4$ $=0.6$
Frequency of homozygous dominant individuals (AA)
$=p^{2}=(0.4)^{2}=0.16(\mathbf{A A})$
Frequency of heterozygous individuals $(Aa)$
$=2 pq=2(0.4)(0.6)=\mathbf{0 . 4 8}(Aa)$
Frequency of homozygous recessive
individuals (aa)
$
=q^{2}=(0.6) 2=\mathbf{0 . 3 6}(\mathbf{a a})
$
