In a test cross between an individual with an unknown genotype that exhibits the dominant phenotype and a known homozygous recessive individual, the progeny showed a 1:1 ratio of dominant to recessive phenotypes. The individual of unknown genotype is therefore ________ for that gene.

Question

Quizplus · Accepted Answer

A 1:1 ratio of dominant to recessive phenotypes in the progeny indicates that the unknown genotype is heterozygous, as it must have one dominant and one recessive allele to produce both phenotypes.

In a Test Cross Between an Individual with an Unknown