Question

The distance between two genes in a chromosome measured in cross-over units which represent

• A. Ratio of crossing over between them
• B. Percentage of crossing over between them
• C. Number of crossing over between them
• D. None of these

Answer 1

Answer: (B)

Percentage of crossing over between them

The cross over percentage differ for different pairs of genes because the amount of crossing over depend on the frequency with which breaks in the chromatids occur between the two genes. This frequency further depends specially on the distance of these genes which are apart on the chromatids.