What are the four major classes of chromosomal rearrangements?

Question

(a) inversions, duplications, translocations, deletions

(b) duplications, reciprocal translocations, nonreciprocal translocations, inversions

(c) deletions, inversions, duplications, point mutations

(d) translocations, pericentric inversions, paracentric inversions, deletions

Answer 1

Chromosomal rearrangements are the result of large pieces of DNA being moved from one location of a chromosome to another location. Point mutations are changes of single nucleotides, and so are not rearrangements. Deletions remove either single or multiple nucleotides, but do not move them to a new location, so they also are not rearrangements.

Duplications, inversions and translocations all move fragments of the chromosome to new locations, so all of those are rearrangements. So the answer is (b) duplications, reciprocal translocations, nonreciprocal translocations, inversions.

Hope this helps