Question

what is the percentage of a homozygous dominant offspring?

Explanation:

Step1: Identify parent genotypes

The Punnett square shows parents are $Yy$ (heterozygous) and $Yy$ (heterozygous).

Step2: Define homozygous dominant

Homozygous dominant genotype is $YY$.

Step3: Count favorable outcomes

From the Punnett square, 1 out of 4 squares is $YY$.

Step4: Calculate percentage

$\frac{1}{4} \times 100\% = 25\%$

Answer:

25%