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 (Pp) is cross-pollinated with a short pea plant (pp)?(1 point) Responses 0.5 0.5 0.75 0.75 1.0 1.0 0.25

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Answer 1

To determine the frequency of short offspring (pp) from a cross between a tall pea plant (Pp) and a short pea plant (pp), we can set up a Punnett Square for the cross.

1. The tall pea plant has the genotype Pp (heterozygous).
2. The short pea plant has the genotype pp (homozygous recessive).

When we cross these two plants, we can list the possible gametes:

• The tall plant (Pp) can produce gametes: P (dominant) and p (recessive).
• The short plant (pp) can only produce gametes: p (recessive).

Now we can set up the Punnett Square:

| | p | p | |-------|-----|-----| | P | Pp | Pp | | p | pp | pp |

From this Punnett Square, we see the potential offspring genotypes:

• 2 Pp (tall)
• 2 pp (short)

This means that out of 4 possible outcomes, 2 are short (pp).

To calculate the frequency of short offspring:

• Frequency of pp = Number of pp offspring / Total offspring = 2/4 = 0.5.

Thus, the frequency of short offspring (pp) is 0.5.