Breeding Dihybrid Crosses

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) were crossed, which would be produced?

A. black and spotted pure-breeding forms
B. black and solid pure-breeding forms
C. red and solid pure-breeding forms
D. red and spotted pure-breeding forms
E. all of these

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...quare.

So when you introduce another dihybrid, like in this question, you will still have the same ratio, only you'll have to double it. Try drawing a 16-celled Punnet square crossing BbSs x BbSs to see what you ...