Q28Short answer
A progeny of F1, is crossed with the homozygous recessive parent. What is this cross called? Work out how is it useful? Ans. When a progeny of F1 is crossed with the homozygous recessive parent, it is called test cross. Such a cross is useful to determine the genotype of an unknown i.e., whether it is heterozygous, or homozygous dominant for the trait.