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) 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) resulting from the cross between a tall pea plant (Pp) and a short pea plant (pp), we can set up a Punnett square.

1. Parent Genotypes:

   • Tall plant (Pp) can produce gametes: P (dominant tall) and p (recessive short).
   • Short plant (pp) can produce gametes: p (only recessive short).

2. Punnett Square:

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

3. Offspring Genotypes:

   • From the Punnett square, we see:
     • 2 offspring will be Pp (tall)
     • 2 offspring will be pp (short)

4. Frequency Calculation:

   • There are a total of 4 offspring.
   • The number of short (pp) offspring is 2.
   • Frequency of short offspring = Number of short offspring / Total number of offspring = 2/4 = 0.5.

Therefore, the frequency of short offspring (pp) when a tall pea plant (Pp) is cross-pollinated with a short pea plant (pp) is 0.5.