Question

Explain a chromosome deletion and the effect it can have on a human.

Answer 1

A chromosome deletion occurs when a chromosomal fragment is lost. Thus the chromosome is missing some genes.
One example of this in humans is know as cri du chat ("cry of the cat"). It occurs from a deletion on chromosome number 5. A child that is born has mental disabilities, a small head with unusual facial features and cries like the sound of a distressed cat. These children rarely live into adulthood.