Question

As a result of linkage and crossing over

• A. Chromatids become chromosomes.
• B. Nuclear divisions come to close.
• C. Chromosomes become half.
• D. Exchange of chromosomal material occurs.

Answer 1

The correct option is D Exchange of chromosomal material occurs.

Linkage: Two genes are said to be under linkage, or linked, when they reside in the same chromosome. Whereas, crossing over may happen when the arms of the chromatids of each homologous chromosomes are paired during meiosis. Matching portions of the extremities of two non-sister chromatids (one from one homologous of the pair) break and the pieces are exchanged, each of them becoming part of the arm of the other chromatid. Both linkage and crossing over results in exchange of chromosomal materials.