Question

In guinea pigs, the gene for a black coat is dominant over the gene for a white coat. What color is a guinea pig with one gene for a black coat and one gene for a white coat?

Answer 1

Here's a hint: A dominant trait will always "trump" the recessive trait.

Answer 2

If they have even 1 gene that is dominant, the colour will be the dominant colour. Such as Aa or AA, both would be black. The only gene form that would make a white fur would be aa, as it doesn't include the dominate gene which is 'A'.