Which of the following hereditary diseases involves multiple genetic mutations?
a. complex
b. chromosomal
c. single-gene
d. autoimmune

The answer is (a.) Complex

It is commonly referred as multifactorial problem type of hereditary or genetic disorder. Commonly, birth defects follow the single gene or chromosomal abnormality. However, some birth defects are due to combined effects of genes and the environment which is also called mutation. Examples include cleft lip or cleft palate, and heart defects.

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