What fraction of the time will the cross of Aa Bb Cc with Aa Bb Cc produce an offspring that expresses the dominant traits A and B and cc ( A _ B _ cc )?
A) 1/32
B) 3/64
C) 1/16
D) 9/64
E) 27/64

Question

What fraction of the time will the cross of Aa Bb Cc with Aa Bb Cc produce an offspring that expresses the dominant traits A and B and cc ( A _  B _ cc )?
A) 1/32
B) 3/64
C) 1/16
D) 9/64
E) 27/64

Quizplus · Accepted Answer

To express the dominant traits A and B, the offspring must have at least one dominant allele for each, which is 3/4 probability for A and 3/4 for B. For cc, the probability is 1/4. Multiply these probabilities: (3/4) * (3/4) * (1/4) = 9/64.

What Fraction of the Time Will the Cross of Aa