Question

What is the percentage of ab gametes produced by parents of genotype $AaBb$?

• A. 20
• B. 25
• C. 50
• D. 75

Answer 1

The correct option is B 25

	A	a
B	AB	aB
b	Ab	ab

All possible gametes of an AaBb parent are shown in the above table, which are 'AB', 'aB', 'Ab' and 'ab'.

Thus one out of the four possible gametes is 'ab' which is 1/4 = 25%.

So, the correct answer is option B.