Question

A tall pea plant results from a dominant tall allele, while the short phenotype results from two recessive alleles. What is the frequency of short offspring (pp) when a tall pea plant with one tall allele (Pp) is cross-pollinated with a short pea plant (pp)?



(2 points)
Responses

1.0
1.0

0.5
0.5

.75
.75

0.25

Answer 1

50% (0.5).

Cross Pp × pp gives offspring Pp and pp in a 1:1 ratio, so half (0.5) are short (pp).