Question

Why is inversion usually less harmful than deletion on a chromosome in a fertilized cell??

Answer 1

Inversion is about breaking a single chromosome into two and will eventually lead to opposite orientation while deletion is when a segment of DNA is missing.

Inversion is safer because it will only divide the chromosomes into 2, which is helpful is there’s a missing chromosome, but deletion have a larger risk since a segment of DNA will be lost leading to some defects.