All 5 Uses

mutation
in
Wonder, by R.J. Palacio
(Edited)

They were told that August had what seemed to be a "previously unknown type of mandibulofacial dysostosis caused by an autosomal recessive mutation in the TCOF1 gene, which is located on chromosome 5, complicated by a hemifacial microsomia characteristic of OAV spectrum."
p. 104.3

mutation = change in the genes that impacts biological traits
Sometimes these mutations occur during pregnancy.
p. 104.4 *

mutations = changes in the genes that determine biological traits
In August's case, the doctors were able to identify one of the "single nucleotide deletion mutations" that made war on his face.
p. 104.8
They use terms like "chromosome rearrangement," or "delayed mutation" to explain why their science is not an exact science.
p. 105.9
There are countless people under words like "germline mosaicism," "chromosome rearrangement," or "delayed mutation."
p. 106.8

Definitions:

(1) (mutation)
a change in the genes that determine biological traits; or the result of the change
(2) (meaning too rare to warrant focus)