I would say the second option. Because colorblindness is regressive that means that there must not be a dominant genotype that replaces colorblindness. In most people there is a dominant genotype that replaces colorblindness which is simply being able to see color. So in me for example I might have a colorblindness genotype somewhere but since it is regressive (b) then it gets taken over but the color vision (B) remember that a dominant will always take over the regressive. the only way that someone can be color blind is if there are 2 regressive (b) genotypes that means there is no dominant genotype to take them over. Brown eyes is an Example of a dominant genotype that means that it will take over blue eyes (which is why there are most brown eyed people in the world)
I chose the second option because there is both X and Y and each one has either a B or a b the last option only had B.
But Remember that B > b
B trumps b
The compound ammonia given by fish is alkaline
-hope this helps!!
Carl Linnaeus is known as the "Father of Modern Taxonomy"
