Question

what is deafness and mutations

Answer 1

Deafness is an etiologically heterogeneous trait with many known genetic and environmental causes. Most cases of genetic deafness result from mutations at a single locus, but an increasing number of examples are being recognized in which recessive mutations at two loci are involved.

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Answer 2

Deafness is ability to not hear
Mutation is a change in the basic structure of a living or developing thing basically in genes