Question

Exchange of segments between non-homologous chromosomes is

• A. Translocation
• B. Inversion
• C. Crossing over
• D. Tetrasomy

Answer 1

The correct option is A Translocation

1) Translocation: a chromosome translocation is a chromosome abnormality caused by rearrangement of parts between non-homologous chromosome. A segment from one chromosome is exchanged with a segment from another non-homologous one, so two translocation chromosomes are generated simultaneously. The exchange of chromosome parts between non-homologous establishes new linkage relations.

2) An inversion is a chromosome rearrangement in which a segment of a chromosome is reversed end to end. An inversion occurs when a single chromosome undergoes breakage and rearrangement within itself.

3) Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis, which results in new allelic combinations in the daughter cells.

4) A tetrasomy is a form of aneuploidy with the presence of four copies, instead of the normal two, of a particular chromosome.

So, the correct answer is 'Translocation'.