Which chromosomal defect is caused when part of a chromosome breaks off and reattaches backward on the same chromosome?

The chromosomal defect caused when part of a chromosome breaks off and reattaches backward on the same chromosome is known as an inversion. Inversions can disrupt gene function and regulation, potentially leading to various genetic disorders or developmental issues. They may not always result in visible phenotypic changes but can affect the offspring if they occur in germ cells.