A true-breeding pea plant with smooth green pods is crossed with a true-breeding plant with constricted yellow pods. The F1 offspring all have smooth green pods. If these F1 individuals are cross-fertilized, what proportion of the F2 offspring are expected to have smooth green pods?Multiple choice question.3/41/49/163/161/2
Question
A true-breeding pea plant with smooth green pods is crossed with a true-breeding plant with constricted yellow pods. The F1 offspring all have smooth green pods. If these F1 individuals are cross-fertilized, what proportion of the F2 offspring are expected to have smooth green pods?Multiple choice question.3/41/49/163/161/2
Solution
This is a classic Mendelian genetics problem.
Step 1: Identify the dominant and recessive traits. In this case, smooth and green are dominant (as they appear in the F1 generation), while constricted and yellow are recessive.
Step 2: Set up the Punnett squares. For the F1 cross, the genotypes of the parents are SsGg (smooth green) x SsGg (smooth green).
Step 3: Determine the possible genotypes of the F2 generation. There are 16 possible combinations: SSGG, SSGg, SsGG, SsGg, SSgG, SSgg, SsgG, Ssgg, sSGG, sSGg, ssGG, ssGg, sSgG, sSgg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG, sgGg, sgG,
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