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. co-dominant, complimentary

E. dominant, recessive

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