In this case, we have a heterozygous dihybrid cross, where we are combining hair color (Black=B, White=b) and hair type (Rough=R, Smooth=r), so for the punnet square we need to obtain first the gametes (combinations)
Parents: BbRr x BbRr
Obtaining gametes
[tex]\begin{gathered} B\begin{cases}R=BR \\ r=Br\end{cases} \\ b\begin{cases}R=bR \\ r=br\end{cases} \end{gathered}[/tex]
Now we can proceed to do the punnet square
