Question

A tall pea plant results from a dominant tall allele. A short phenotype requires that an individual has two recessive alleles. A short pea plant (pp) is crossed with a tall pea plant (Pp).
What is the frequency of short offspring (pp) from this crossing?

0.25
0.75
1.0
0.5

Answer 1

0.5

Explanation: pp × Pp produces gametes p with p; and P or p. Offspring genotypes are Pp (tall) and pp (short) in a 1:1 ratio, so 50% short.