Question

Linkage ________ as the distance between two genes ______________ a. Increases, Increases b. Unaffected, Decreases c. Decreases, decreases d. Decreases, Increases

Answer 1

The association between genes or the DNA sequences when they are present on the same chromosome. This is known as linkage.

The probability of linkage to be the greatest will be if the two genes are closely linked to each other.

The linkage decreases the chances of recombination during meiosis.

Some of the factors which affect linkage are:

• Distance between the genes
• Age
• Temperature
• X-rays

The distance between the genes and the probability of linkage are in inverse relation.

Hence, linkage decreases as the distance between two genes increases.

Thus the correct option is (d) Decreases, Increases.