In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over?

Question

spotted (s). If two dihybrids (Bb Ss) were crossed, what fraction of the black solid offspring would be homozygous?

1. 4/16

2. 9/16

3. 1/9

4. 3/16

5. 3/4

Answer 1

I'm pretty sure it's 4/16.

not 100% though.

Answer 2

You have a 1/4 chance of having a BS gamete, and 1/4 chance of combining with a BS gamete. 1/4 * 1/4 = 1/16

You have a 1/16 chance of BBSS.