Question

In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y)...

In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y).

a) What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants?

b) How many squares do you need to do a Punnett square analysis of this cross?

c) Is a green pea outcome possible? Why or why not?

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Answer #1

a) Cross PpYY X ppYy

Gametes formed PY and pY pY and py.

Next generation:

Male/Female PY pY
pY PpYY(purple flower with yellow seed pea) ppYY(white flower with yellow seed pea)
py PpYy(purple flower with yellow seed pea) ppYy(white flower with yellow seed pea)

The possible genotypes - PpYY, ppYY, PpYy and ppYy.

The possible phenotypes - Purple flower with yellow seed pea and White flower with yellow seed pea.

b) 4 squares are required.

c) No, the green pea outcome is not possible. Because no pea plants have yy genotypes.

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