Question

A purple flowered pea plant is crossed with a white flowered pea plant. Among the progeny, there are equal number of purple and white flowered plants. The result indicates that it is ______.

Options

• a test cross

• a cross showing independent assortment

• an example of incomplete dominance

• an example of co-dominance

Answer 1

A purple flowered pea plant is crossed with a white flowered pea plant. Among the progeny, there are equal number of purple and white flowered plants. The result indicates that it is a test cross.

Explanation:

1. A test cross is the cross between a F₁ hybrid and its homozygous recessive parent. It is performed to find out the genotype of any plant with dominant expression.
2. In the given cross, among the progeny, purple and white flowers are in a 1:1 ratio, concluding that the purple plant is heterozygous.