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

0.75
0.75

0.25
0.25

Answer 1

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 simple Punnett square.

The parental genotypes are:

• Short parent: pp (homozygous recessive)
• Tall parent: Pp (heterozygous)

Setting up the Punnett square:

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

From the Punnett square, we can see the possible offspring:

• 2 Pp (tall)
• 2 pp (short)

This gives us a total of 4 offspring from the cross. Out of these, 2 are short (pp).

To find the frequency of short offspring (pp):

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

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