Question

In prairie chickens the gene for throat sac size shows simple dominant-recessive inheritance. A recessive allele causes small throat sacks and a dominant allele causes large throat sacks. In a certain population of chickens, 264 chickens show the recessive phenotype and 788 chickens show the dominant phenotype.
What is the frequency of the homozygous recessive genotype?

• A. $0.75$
• B. $0.5$
• C. $0.25$
• D. $1$

Answer 1

The correct option is C $0.25$

In the prairies,

264 chickens show recessive phenotypes

788 chicken show dominant phenotypes (both heterozygous and homozygous)

total number of chickens is 1052

the chickens with recessive condition is almost 1/4${}^{th}$ of the total number of progenies

So, the frequency of the recessive genotype is 0.25

So, the correct answer is '0.25'