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 with one tall allele (Pp) is cross-pollinated with a short pea plant (pp)?(1 point)

Question

Responses

1.0
1.0

0.5
0.5

0.75
0.75

0.25

Answer 1

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

1. The possible alleles from the Pp parent are:

   • P (tall)
   • p (short)

2. The possible alleles from the pp parent are:

   • p (short)
   • p (short)

Now we can create the Punnett square:

      P       p
     __________
p |   Pp    |   pp   |
   |_________|
p |   Pp    |   pp   |
   |_________|

From this, we see the possible genotypes of the offspring:

• 2 Pp (tall)
• 2 pp (short)

Thus, the frequency of short offspring (pp) is:

• 2 short (pp) out of a total of 4 offspring.

This can be calculated as: \[ \frac{2 \text{ (pp offspring)}}{4 \text{ (total offspring)}} = 0.5 \]

Therefore, the frequency of short offspring (pp) when a Pp plant is crossed with a pp plant is 0.5.