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)

Question

Responses

0.5
0.5
0.75
0.75
1.0
1.0
0.25

Answer 1

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

Parents:

• Tall plant (Pp)
• Short plant (pp)

The possible gametes from each parent are:

• Pp can produce gametes: P and p
• pp can produce gametes: p and p

Now, we fill in the Punnett square:

        |   p   |   p   |
------------------------
    P   |   Pp  |   Pp  |  (Tall)
------------------------
    p   |   pp   |   pp  |  (Short)

From the Punnett square, we can see the genotypes of the offspring:

• 2 Pp (tall)
• 2 pp (short)

This means there is a total of 4 offspring, with 2 of them being short (pp).

To find the frequency of short offspring: \[ \text{Frequency of pp} = \frac{\text{Number of pp offspring}}{\text{Total number of offspring}} = \frac{2}{4} = 0.5 \]

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