What percentage of offspring from a cross between a homozygous type A parent with a heterozygous Type A parent is expected to contain the I allele

a) 100%

b) 50%

c) 75%

d) 25%

The correct answer is option B, 50%

Let us take the following case:

Genotype of heterozygous parent - (Aa)

Genotype of homozygous parent - (aa)

Allele I - (Aa)

Allele II - (aa)

The cross between the two is shown below:

Aa X aa

Aa, Aa, aa, aa

There are 50 % Aa, and 50 % aa allele.

Thus, the allele I (Aa) is 50 %.