Question

Test cross is a cross between

• A. Hybrid $\times$ Dominant parent
• B. Hybrid$\times$ Recessive parent
• C. Hybrid$\times$ Hybrid parent
• D. Two distantly related species

Answer 1

The correct option is B Hybrid$\times$ Recessive parent

A test cross is performed to determine the genotype of a dominant parent if it is a heterozygous or homozygous-dominant. For the purpose, the hybrid is crossed with homozygous recessive parent. This makes option B correct.

Back cross is cross between $F_1$ hybrid and one of the parent (either dominant or recessive) to deduce the genotype of both parents and the hybrid. This makes option A correct.

Option C is incorrect as one parent is always homozygous recessive in a test cross.

Option D is incorrect as a cross between two distantly related species is termed as hybridization.

Therefore, the correct answer is option B.