Who is the father?

!! I started off my day with cuties!! :D

Look at them! SO CUTE!!

Aww.. adorable :) 

However, the picture reveals an essential question --- what is the genotype of the father? What does he look like in order to produce cuties like them?

And now, it's time to use genetics, our detective skill to figure out the genotype of the father.

As shown in the picture, the genotype of the mother is eebb, since she has yellow fur, brown nose,

brown eyelids and brown ears. 

The puppies have two different colors of fur. One color is black, and the other one is chocolate (in between yellow and black). There is no yellow color. Thus, for the fur color, the father should be EE so that the puppies would be heterozygous. Based on the pictures above, the puppies would have either black nose, black eyelids and black ears or brown nose, brown eyelids and brown ears. Thus, the genotype of the father would be Bb. In that way, the puppies would be either heterozygous or homozygous recessive. 

All in all, the genotype of the father would be EEBb.