Consider a, b, and c, different genes that all reside on the same chromosome. Genes a and b are 10 cM apart, b and c are 2 cM apart, and a and c are 8 cM apart. What is the order of these genes?
A) a, b, c
B) a, c, b
C) b, a, c
D) c, a, b
E) The order cannot be determined from the information given.

Question

Quizplus · Accepted Answer

From the information given, we know that gene b is located between a and c, since it is 10 cM away from a and 2 cM away from c. We also know that the distance between a and c is 8 cM, so if b is in the middle, the order must be a, c, b. Therefore, the correct answer is B.

Consider A, B, and C, Different Genes That All Reside