Question

what is the percentage of homozygous recessive offspring? 75% 50% 0% 25%

Explanation:

Step1: Count total offspring

The Punnett square has 4 cells (offspring): Yy, Yy, yy, yy. So total = 4.

Step2: Count homozygous recessive (yy)

Homozygous recessive are yy. From the square, there are 2 yy.

Step3: Calculate percentage

Percentage = $\frac{\text{Number of yy}}{\text{Total offspring}} \times 100 = \frac{2}{4} \times 100 = 50\%$.

Answer:

50% (corresponding to the option with "50%")