Homework Answers
RrBb * RrBb
| RB | Rb | rB | rb | |
| RB | RRBB (rough, black fur) | RRBb (rough, black fur) | RrBB (rough, black fur) | RrBb (rough, black fur) |
| Rb | RRBb (rough, black fur) | RRbb (rough, white fur) | RrBb (rough, black fur) | Rrbb (rough, white fur) |
| rB | RrBB (rough, black fur) | RrBb (rough, black fur) | rrBB (smooth, black fur) | rrBb (smooth, black fur) |
| rb | RrBb (rough, black fur) | Rrbb (rough, white fur) | rrBb (smooth, black fur) | rrbb ( smooth, white fur) |
the expected proportion of black, smooth fur = number of black, smooth fur/total number
= 3/16
expected number of black and smooth fur=expected proportion of
black, smooth fur 
total number of progeny
=3/16464
= 87
so the answer is D) 87
2) the phenotypic ratio is
black, rough: black, smooth: white, rough: white, smooth=9:3:3:1 ( from the punnet square)
so the answer is a) 9:3:3:1
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