In pea plants, tall plants are dominant over short, and green pods are dominant over yellow. If you were to cross true-breeding tall, green-podded plants with true-breeding short, yellow-podded plants, and then were to cross the F1 individuals among themselves, what proportion of the F2 offspring would you expect to be tall and yellow-podded?

3/16

Explanation:

Let's assume that the allele "T" gives a tall phenotype while the allele "t" gives a short phenotype. The allele G gives green pods while the recessive allele "g" gives yellow pods. The genotype of true-breeding tall, green-podded plants would be TTGG and that of the true-breeding short, yellow-podded plants would be ttgg. A cross between TTGG and ttgg obtains all "TtGg" plants in F1 progeny. The F2 generation obtained by crossing F1 plants would have the following phenotype ratio=

TtGg x TtGg = 9/16 tall and green: 3/16 tall and yellow: 3/16 short and green: 1/16 short and yellow.

So, the proportion of the tall and yellow-podded F2 progeny= 3/16

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