A tall, heterozygous pea plant is cross-pollinated with another tall, heterozygous pea plant. Use a Punnett square to determine the probability that the offspring is a tall, homozygous pea plant.(1 point)

Question

Responses

75%
75%

25%
25%

50%
50%

0%

Answer 1

To determine the probability of the offspring being a tall, homozygous pea plant from a cross between two tall, heterozygous pea plants, we can set up a Punnett square.

1. Let's define the alleles:

   • T = tall (dominant)
   • t = short (recessive)

2. The genotypes of the parents are both Tt (heterozygous tall).

3. Setting up the Punnett square:

          T      t
        ----------------
    T |   TT    |   Tt   |
        ----------------
    t |   Tt    |   tt   |
        ----------------

4. From the Punnett square, we see the possible genotypes of the offspring:

   • TT (homozygous tall)
   • Tt (heterozygous tall)
   • Tt (heterozygous tall)
   • tt (homozygous short)

5. The results of the square show:

   • 1 TT (tall homozygous)
   • 2 Tt (tall heterozygous)
   • 1 tt (short homozygous)

6. Now we can calculate the probabilities:

   • Total offspring = 4
   • Tall homozygous (TT) = 1

Probability of a tall, homozygous pea plant (TT) = 1/4 = 25%.

Therefore, the answer is 25%.