Two black female mice mated with a brown male. One female gave 19 black

Two black female mice mated with a brown male. One female gave 19 black and 17 brown offspring, and the other 33 black. Which trait is dominant? Determine the genotypes of parents and offspring?

Let’s designate black color with the letter “A”, brown color with the letter “a”.
1.Aa – black (19 pieces)
aa – brown (17 pieces)
Parent genotypes: Aa and aa
Descendant genotypes: Aa and aa

2. Aa – black (33 pieces)
Parent genotypes: AA and aa
Descendant genotypes: Aa.

By the number of descendants of black color, it is obvious that black color dominates.