Question

In a certain population of frogs, 120 are green, 60 are brownish green, and 20 are brown. The allele for brown is denoted GB, while that for green is GG, and these two alleles are incompletely dominant. a. What are the genotype frequencies in the population

Answer 1

$GG \times GG$ = homozygous dominant = 0.6

$GG \times GB$ = heterozygous = 0.3

$GB \times GB$ = homozygous recessive = 0.1

Explanation:

Given:

Green frog GG= 120

Brownish green frog= 60

Brown frog GB= 20

Total no. of frogs= 200

Genotype frequencies=?

$GG \times GG$ = homozygous dominant = 120/200 = 0.6

$GG \times GB$ = heterozygous = 60/200 = 0.3

$GB \times GB$ = homozygous recessive = 20/200 = 0.1