Question

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

• A. BB
• B. bb
• C. Bb
• D. BB/Bb

Answer 1

The Correct Option is B

To determine the genotype of a black-seed plant, a test cross is performed. A test cross involves crossing the organism with a homozygous recessive individual (bb).

- If the offspring produce both black and white seeds, the parent is heterozygous (Bb).
- If all offspring have black seeds, the parent is homozygous dominant (BB).

Thus, to determine the genotype of the black-seed plant, you must cross it with a plant having the recessive genotype bb.