Question

In Mendel's cross beginning with two pure strains of pea plants, one with yellow seeds and the other with green seeds, the test cross was done between $F_2$ offspring with yellow seeds and a pure strain of plants with the genotype

• A. Y/Y
• B. y/y
• C. Y/y
• D. YY/yy

Answer 1

The correct option is B y/y

In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of an individual with a homozygous recessive individual. This is done in order to determine the genotype (heterozygous or homozygous nature) of the other individual by analyzing proportions of offspring phenotypes. Since this is usually carried out between the F2 offspring with the homozygous recessive parent, the pure strain of the plant used will be y/y. So, the correct option is 'y/y'.