Question

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross are known as:

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

Answer 1

The correct option is A

Reciprocal cross

The correct option is A.

Explanation of correct option:

1. For the determination of parental sex during the inheritance of the trait, the reciprocal cross is done.
2. In this case, the sources of gametes are reversed.
3. For carrying a successful reciprocal cross, all the parent organisms must be true-breeding.

Explanation of incorrect options:

Option B:

1. A test cross is done to know about the genotype of the organism.
2. An organism having recessive genotype and phenotype is crossed with an organism having dominant phenotype but unknown genotype.

Option C:

1. Reverse cross has not been defined particularly in genetics.

Option D:

1. A cross between two different organisms where both are heterozygous for two different traits is referred to as a dihybrid cross.

Final answer: Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross are referred to as reciprocal cross.