Principles of Inheritance and Variation Question 68

68. 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?

[2002]

(a) b, a, c

(b) a, b, c

(c) a, c, b

(d) none of these

Show Answer

Answer : a

Hints & Solution

(a) $a-b=20 %, b-c=28 %, a-c=8 %$ Percent crossing over between two genes is proportional to the distance between them.