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

Multiple Choice

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