Question

A test cross (cross between $F_1$ hybrid progeny and parents either male (dominant) or female recessive) is performed to distinguish between

• A. Two homozygous form
• B. Two heterozygous forms
• C. A homozygous dominant and a heterozygous recessive form
• D. A homozygous recessive and heterozygous dominant form

Answer 1

The correct option is C A homozygous dominant and a heterozygous recessive form

Test-cross is an experimental method to determine the genotype of organisms. In this cross, the unkown genotype is crossed with known homozygous recessive genotype. It is used to distinguish the pure homozygous (recessive) and hybrid (heterozygous dominant). Thus, the correct answer is option C.