I totally don't get this question.. Plzz help me out.. The Question is

In sheep, the allele for white wool(A) is dominant over the allele for black wool(a). How would u determine the genotype of a white ram, or a male sheep?

Help... what does this mean... if u can answer... it's even better... plzz

Well... if you know the white allele is dominant you know the ram is either AA or Aa... either homozygous or heterozygous.

The question is asking how you can determine whether its AA or Aa. Mendel used cross-breeding to help understand the answer...

So how could you breed this ram with another sheep to determine if its AA or Aa...

That's the question... I won't answer it, as AMHD states we won't do your work for you, but I will comment on any thoughts you have about it.

Think about what should happen to the progeny if it is AA versus if its Aa.