If both a mother and a father carry a dominant gene for dark eyes and a recessive gene for light eyes (Bb), what is the likelihood that their offspring will have dark eyes?
Responses
A 1 in 41 in 4
B 2 in 32 in 3
C 3 in 43 in 4
D 4 in 4
A 1 in 4
Explanation: When both parents carry a dominant gene for dark eyes and a recessive gene for light eyes, the possible combinations for their offspring are BB, Bb, bB, and bb. Only the BB and Bb combinations will result in dark eyes, which means there is a 3 out of 4 chance that the offspring will have dark eyes.