Question

Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called:

• A. Reciprocal cross
• B. Test cross
• C. Dihybrid cross
• D. Back cross

Answer 1

The correct option is B

Test cross

The correct option is B:

Explanation of the correct option:

1. A test cross involves mating an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration.
2. It is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype.

Explanation of the incorrect options:

Option A:

A cross in which the sex of two parents is reversed is a reciprocal cross.

Option C:

A dihybrid cross is a cross between two traits to study their inheritance from parents to offspring.

Option D:

The mating of a hybrid organism with one of its parents or with an organism genetically similar to the parent.

Final answer: Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called test cross.