Question

a genetic disease is a condition caused by in one or more genes.

Explanation:

Genetic diseases result from alterations in genes. These alterations can be mutations (changes in the DNA sequence of a gene) or other types of genetic abnormalities. Mutations can occur spontaneously or be inherited. They disrupt the normal function of genes, which are responsible for producing proteins that carry out various functions in the body. When genes are not functioning properly due to these changes, it can lead to the development of a genetic disease.

Answer:

mutations (or genetic abnormalities)