Black coat color is dominant over white coat in guinea pigs.?

Question

a cross between 2 black guinea pigs resulted in 4 offsrpings,all of which were black could both parents be hybrids?

Answer 1

This is more likeky a cross between two pure-breeds (both are homozygous dominant).

Let B=black and b=white

In a cross between

                BB and BB (pure-breeds), all offsprings are BB hence all are black..