In dogs, phenotype A (erect ears and barking while following a scent) is caused by dominant alleles; phenotype B (droopy ears and silent while following a scent) is caused by recessive alleles. A dog that is homozygous for both traits of phenotype A is mated to a dog with phenotype B. If the genes for the two traits are unlinked, which of the following is (are) the expected F₁ phenotypic ratio(s)? A) 9:3:3:1 B) 1:1 C) 16:0 D) 1:2:1 E) None of the above

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When a homozygous dominant dog (AA) is crossed with a homozygous recessive dog (aa), all F1 offspring will be heterozygous (Aa) and exhibit the dominant phenotype, resulting in a 16:0 ratio.

In Dogs, Phenotype a (Erect Ears and Barking While Following