In peas, yellow pods are dominant to green pods. A homozygous recessive pea plant crosses with a heterozygous pea plant. Use the completed Punnett Square below to determine the probability that the offspring will have green pods.

Explanation:

Use a upper case to identify the dominant allele and lower case to identify recessive allele.

A homozygous pea plant would be YY or gg. The homozygous recessive pea pleant would be gg (YY is dominant).

A heterozygous pea plant would be Yg (or gY which is the same).

The Punnett Square for the cross between a homozygous recessive pea plant (gg) and a heterozygous pea plant (Yg) would be:

                 g        g

       Y      Yg      Yg

       g      gg      gg

Hence, the offspring will have two Yg, which would be yellow pods, and two gg which would be green pods.

That is, 50% of the offspring will have yellow pods and 50% will have green pods.

the answer is option a.

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