Some dogs have erect ears; others have drooping
ears. Some dogs bark when following a scent; others
are silent. Erect ears and barking are due to dominant
alleles located on different chromosomes. A dog
homozygous for both dominant traits is mated to a
droopy-eared, silent follower. The expected
phenotypic ratio in the F1 generation is
a. 9:3:3:1.
b. 100 percent of one phenotype.
c. 1:1.
d. 1:2:1.
e. none of these.
Answer: b
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