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There are three genes a, b, c. Percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?

1. b, a, c
2. a, b, c
3. a, c, b
4. none of these

Correct answer: a, c, b

Solution

If one gene lies between the other two, the distance between the outer genes should equal the sum of the two shorter intervals. Here, a–c is 8% and c–b is 28%, while a–b is 20%, so c must be between a and b, giving a, c, b.

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