What is a cross of F1 with its homozygous recessive parent known as?

✅Explanation:
A test cross is a genetic cross between an individual with an unknown genotype (typically the F1 generation, which is heterozygous) and a homozygous recessive individual. The purpose of a test cross is to determine the unknown genotype of the F1 individual. If the offspring of the test cross all exhibit the dominant phenotype, the F1 individual is homozygous dominant. If the offspring exhibit a 1:1 ratio of dominant to recessive phenotypes, the F1 individual is heterozygous.

📌Other Options:
(a) Reciprocal cross: A reciprocal cross involves two crosses where the sexes of the parents are reversed to determine if a trait is sex-linked.
(c) Top cross: A top cross is a cross between a purebred male and a female of unknown ancestry.