In cocker spaniels, solid color (A) is dominant over spotted (a), and black coat color (B) is dominant over red (b). If two solid black dogs were crossed several times and their offspring were eighteen solid black and five spotted black puppies, the genotypes of the solid black parents would most likely be:.A. Аа Bb x AA ВbB. Аа BB х аа Вb C. Aa Bb x Аа Bb D. AABB x Aa Bb E. aa Bb x AA Bb

Explanation:

As given;

Solid color is dominant on  spotted color,  

so A is dominant on a.

black coat color (B) is dominant on red (b) color

so B is dominant over b.

cross between two solid black dogs several times and their offspring were 18 solid black and 5 spotted black puppies. so the parents will be Аа Bb x AA Вb, due to the effect of dominant.

i believe the answer would be b. hope it : )