In dogs, black coat color is determined by the B gene, brown – b, solid – S, piebald – s. Black parents have 6 puppies – all black.

In dogs, black coat color is determined by the B gene, brown – b, solid – S, piebald – s. Black parents have 6 puppies – all black. What are the possible genotypes of the parents?

The following options for combining parental genotypes are possible:
a) both – BBSS;
b) one is BBSS, the other is BBSs;
c) one is BBSS, the other is BbSS;
d) one is BBSS, the other is BbSs;
e) one is BbSS, the other is BBSs.

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