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

0.5
0.5

0.75
0.75

0.25
0.25

1.0

Answer 1

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

The parents are:

• Short plant (pp)
• Tall plant (Pp)

The possible gametes from each parent are:

• From the short plant (pp): p, p
• From the tall plant (Pp): P, p

Now we can set up the Punnett square:

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

From the Punnett square, we can see the resulting genotypes for the offspring:

• 2 (Pp) - Tall
• 2 (pp) - Short

So, there are 2 short offspring (pp) out of a total of 4 offspring.

To find the frequency of short offspring:

Frequency of short offspring (pp) = Number of pp offspring / Total offspring = 2 / 4 = 0.5

Therefore, the answer is 0.5.