Monohybrid Cross Problem Set

Problem 8: Predicting the results of a test cross


A test cross is used to determine if the genotype of a plant with the dominant phenotype is homozygous or heterozygous. If the unknown is homozygous, all of the offspring of the test cross have the __________ phenotype. If the unknown is heterozygous, half of the offspring will have the __________ phenotype.

A. dominant, incompletely dominant

B. recessive, dominant

C. dominant, epistatic

D. codominant, complimentary

E. dominant, recessive

The test cross was invented by Mendel to determine the genotype of plants displaying the dominant phenotype.

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