AP BIOLOGY

CELL DIVISION

MEIOSIS AND GENETIC VARIATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the probability that the following parents:AABbcc x aabbCC will produce the following offspring:AaBbCc?
A
0
B
1/32
C
1/16
D
1/2
E
1/4
Explanation: 

Detailed explanation-1: -The correct answer is the last choice, 1/64.

Detailed explanation-2: -Trihybrid Cross: Cross between two heterozygous individuals involving three different traits. A cross between AaBbCc and AaBbCc, which involves a cross of three different traits is an example of a trihybrid cross.

Detailed explanation-3: -In this way 8 types of phenotypes will be obtained from this cross-AaBbCc, AabbCc, AaBbcc, Aabbcc, aabbcc, aaBbcc, aabbCc and aaBbCc. Also, since in the heterozygous parent 3 genes are in heterozygous condition, i.e., n = 3, therefore according to the formula, 2n=23=8. Hence, 8 phenotypes are possible.

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