white feathers in canaries are dominant to yellow feathers. a heterozygous canary is crossed with a…

white feathers in canaries are dominant to yellow feathers. a heterozygous canary is crossed with a homozygous recessive canary. what is the ratio of the offspring that are homozygous to the total number of offspring? what percent of the offspring will be heterozygous? done

white feathers in canaries are dominant to yellow feathers. a heterozygous canary is crossed with a homozygous recessive canary. what is the ratio of the offspring that are homozygous to the total number of offspring? what percent of the offspring will be heterozygous? done

Answer

Explanation:

Step1: Set up the cross

Let the dominant allele for white feathers be (A) and the recessive allele for yellow feathers be (a). The heterozygous canary has genotype (Aa) and the homozygous - recessive canary has genotype (aa). The Punnett - square cross is set up as follows:

(a) (a)
(A) (Aa) (Aa)
(a) (aa) (aa)

Step2: Calculate the ratio of homozygous offspring

The homozygous offspring have genotype (aa). There are 2 (aa) out of a total of 4 offspring. The ratio of homozygous offspring to the total number of offspring is (\frac{2}{4}=\frac{1}{2}).

Step3: Calculate the percentage of heterozygous offspring

The heterozygous offspring have genotype (Aa). There are 2 (Aa) out of a total of 4 offspring. The percentage of heterozygous offspring is (\frac{2}{4}\times100% = 50%).

Answer:

  1. (\frac{1}{2})
  2. (50)