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

0%
0%

75%
75%

50%
50%

25%

Answer 1

To determine the probability that the offspring from a cross between two heterozygous tall pea plants (Tt × Tt) is a tall, homozygous pea plant (TT), we can use a Punnett square.

1. Identify the alleles: Where "T" represents the tall allele (dominant) and "t" represents the short allele (recessive).
2. Set up the Punnett square:

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

3. Determine the genotypes of the offspring:

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

4. Count the total outcomes: There are 4 total outcomes (1 TT + 2 Tt + 1 tt).

5. Calculate the probability of TT:

   • Probability of being homozygous tall (TT) = Number of TT outcomes / Total outcomes = 1/4 = 25%.

Thus, the probability that the offspring is a tall, homozygous pea plant is 25%.