Question

when does a geneticists need to carry a test cross ​

Answer 1

Explanation:

A geneticist need to carry a test cross when the genotype of an organism is unknown. In a test cross a homozygous recessive individual is crossed with the unknown genotype individual having a dominant phenotype

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Answer 2

Answer:

Individuals that show the dominant phenotype, however, may either be homozygous dominant or heterozygous. The phenotypically dominant organism is the individual in question in a test cross. The purpose of a test cross is to determine if this individual is homozygous dominant or heterozygous.