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).

Question

What is the frequency of short offspring (pp) from this crossing?

(1 point)
Responses

1.0
1.0

0.5
0.5

0.25
0.25

0.75

Answer 1

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

The alleles are:

• P = dominant tall allele
• p = recessive short allele

The genotypes of the parent plants are:

• Short plant: pp
• Tall plant: Pp

Here is how the Punnett square looks for this cross:

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

From the Punnett square:

• 50% (2 out of 4) of the offspring are Pp (tall).
• 50% (2 out of 4) of the offspring are pp (short).

Therefore, the frequency of short offspring (pp) from this crossing is 0.5.

The correct response is: 0.5