The following is a list of the phenotypic classes recovered among the offspring
ID: 63630 • Letter: T
Question
The following is a list of the phenotypic classes recovered among the offspring from a testcross of a trihybrid genotype (AaBbCc). The number of individuals in each class is indicated. What is the order of the three genes?The following is a list of the phenotypic classes recovered among the offspring from a testcross of a trihybrid genotype (AaBbCc). The number of individuals in each class is indicated. What is the order of the three genes?
ABC 1
aBC 85
AbC 8
ABc 420
Abc 75
aBc 11
abC 400
abc 0
What is the order of these three genes in the chromosome?
1) ABC
2) CAB
3) ACB
Explanation / Answer
The order cannot be ABC or abc because the number of individuals these two classes is least.
Maximum number is in class ABc = 420 and abC = 400. There was crossing over between B and C, means B and C are far apart. A and B are close. So, only option 2) fits well. The order should be CAB.
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