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)?
0.25
0.75
0.5
1.0
The cross-pollination will result in offspring with the genotype Pp and pp.
Half of the offspring will inherit the recessive allele from the tall parent and have the genotype Pp, while the other half will inherit the recessive allele from both parents and have the genotype pp.
Therefore, the frequency of short offspring with the pp genotype is 0.5 or 50%.