Some Dogs Have Erect Ears; Others Have Drooping Ears

question 9

Multiple Choice

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.

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