We have normal wings and we have vestigial wings. Likewise, we have two different types of colors. We have the gray color and we have black color. Now, it turns out that normal wings that we're going to designate with blue uppercase V is dominant over the recessive vestigial wing, which we're going to designate with purple lowercase V. And by the same token, the color gray is dominant over the color black. So the color gray, we're going to designate with red uppercase B. And the color black, we're going to designate with orange lowercase B.