inversions in chromosomes occur when part of a chromosome breaks out and is reinserted upside down. which of…

Brief Explanations:

In chromosome inversion, a segment of the chromosome breaks off and re - inserts in the reverse orientation. In option F, the segment 'DEF' has broken off and re - inserted as 'FED', which is an inversion. In option G, there is no change in the order of genes. In option H, there is an addition of new genes 'Q' and 'R' which is not an inversion. In option I, there is a duplication of the 'ABC' segment which is not an inversion.

Answer:

F. Before: ABCDEFXYZ, After: ABCFEDXYZ