Problem 2: When does a phenotype ratio of 9:3:3:1 occur?
A phenotype ratio of 9:3:3:1 in the offspring of a mating of two organisms heterozygous for two traits is expected when:
A. the genes reside on the same chromosome
D. only recessive traits are scored
E. none of the above.
University of Arizona
Revised: October 30, 2003
Contact the Development Team