A Mendelian test cross is used to determine whether:

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A Mendelian test cross is used to determine whether an individual is homozygous or heterozygous for a specific trait. This is typically performed by crossing the individual in question with a homozygous recessive individual, and observing the resulting offspring. If all offspring display the dominant phenotype, the parent is likely homozygous dominant. If there is a 1:1 ratio of dominant to recessive phenotypes, the parent is likely heterozygous.

A Mendelian Test Cross Is Used to Determine Whether