Ask a New Question
Menu

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?

(1 point)
Responses

0.25
0.25

0.5
0.5

0.75
0.75

1.0

1 answer

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

  1. Genotypes of Parents:

    • Short plant (pp) - homozygous recessive
    • Tall plant (Pp) - heterozygous

  2. Gametes:

    • The short plant can only produce p gametes.
    • The tall plant can produce P and p gametes.

  3. Punnett Square:

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

From the Punnett square, the offspring combinations are:

  • Pp (tall) - 2 occurrences
  • pp (short) - 2 occurrences
  1. Calculating Frequency: Out of a total of 4 possible offspring:
  • 2 offspring are short (pp).

The frequency of short offspring (pp) = Number of short offspring / Total offspring = 2 / 4 = 0.5.

Therefore, the correct response is:

0.5.