Question

In pea plants, purple flowers are dominant to white flowers. Suppose two heterozygous purple-flowered plants (Tt) are crossed. What percentage of offspring will also have purple flowers?

Answer 1

Answer:

75%

Explanation:

This question involves a single gene coding for flower color in pea plants. The allele for purple flowers (T) is dominant over the allele for white flowers (t).

According to the question, two heterozygous purple-flowered plants (Tt) are crossed i.e. Tt × Tt. The following gametes will be produced by each parent; T and t. Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:

TT, Tt, Tt, and tt.  

Since purple allele (T) is dominant, offsprings TT, Tt, and Tt will be phenotypically purple-flowered. Hence, ¾ × 100 = 75% of offsprings will have purple flowers.