Question

For pea plants, T represents a dominant allele for tall pea plants and t is the recessive allele for short pea plants. If two plants with the Tt genotype are crossed, what is the probability that offspring will exhibit the dominant trait?

100%

75%

50%

25%

Answer 1

Answer: 75%

Step-by-step explanation:

Set up a Punnett square with both parents having the Tt genotype. The 4 offspring will have the genotypes TT, Tt, Tt, and tt.

Since T is dominant, all offspring that carry at least 1 copy of it will exhibit the trait. 3/4 of the offspring carry at least 1 copy of T, so 3/4 or 75% of the offspring will exhibit the dominant trait.