question_answer

Test cross involves

A)  crossing between two genotypes with recessive trait

B)  crossing between two F, hybrids

C)  crossing the \[{{F}_{1}}\]hybrid with a double recessive genotype

D)  crossing between two genotypes with dominant trait

Correct Answer: C

Solution :

 The test cross involves the crossing of F, hybrid with a double, recessive genotypic parent. By test cross, the heterozygocity and homozygocity of the organism can be tested. Thus, the offspring will be 100% dominant, if the individual, which crossed with recessive parent i.e., (tt) was homozygous dominant and ratio will be  50% dominant and 50% recessive if the individual 1 was heterozygous dominant. In dihybrid test cross, ratio will be 1:1:1:1.