From a cross of AaBb X AaBb what is the probability to produ

From a cross of AaBb X AaBb, what is the probability to produce either A-B- or aaBB zygotes? what is the probability to produce either AAB- or aabb zygotes?

Solution

AaBb x AaBb

Probability to produce A-B- zygotes = 9/16

Probability to produce aaBB zygotes = 1/16

Therefore probability of producing either A-B- or aaBB zygotes = 9/16 + 1/16 = 10/16

Probability to produce AAB- zygotes = 3/16

Probability to produce aabb zygotes = 1/16

Therefore probability of producing either AAB- or aabb zygotes = 3/16 + 1/16 = 4/16 = 1/4