Question

Scale coloration of lizards has a complete dominance relationship where green scales are dominant over blue scales. there are 1,024 individuals with the genotype gg, 512 individuals with the genotype gg, and 64 individuals with the genotype gg. find: the frequency of the dominant and recessive alleles and the frequency of individuals with dominant, heterozygous, and recessive genotype.

Answer 1

Answer:

The correct answer would be:

• Frequency of recessive allele (q) = 0.2 or 20 percent
• Frequency of dominant allele (p) = 0.8 or 80 percent
• The frequency of homozygous dominant individuals (p²) = 0.64 or 64 percent.
• The frequency of homozygous recessive individuals (q²) = 0.04 or 4 percent.
• Frequency of heterozygous dominant indivduals (2pq) = 0.32 or 32 percent.

It can be explained with the help of the Hardy-Weinberg equation:

p + q = 1

p² + q² + 2pq = 1

q² represent the frequency of individuals with homozygous recessive genotype. It can be calculated by dividing the number of individuals with homozygous recessive genotype with a total number of individuals in a population.

Thus, q² = $\frac{64}{1600}$

⇒$\frac{4}{100}$ ⇒ 0.04

Hence, q = $\sqrt{0.04}$ = 0.2

As we know p + q = 1

thus, p = 1 - 0.2 = 0.8