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7 March, 13:28

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.

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  1. 7 March, 14:43
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    50% of 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.
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