Somatic mutations occur in the body cells and can lead to genetic mosaicism, where different parts of the body have different genetic makeups. This shows that an individual does not have a single permanent genotype. Somatic mutations do not typically occur in sex cells or in cells that give rise to gametes, and maternal age actually increases the risk of somatic mutations.

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Somatic Mutation

Question 28

Multiple Choice

Somatic mutation

A) typically occurs in sex cells.
B) decreases with maternal age.
C) shows that each of us does not have a single, permanent genotype.
D) takes place in the cells that give rise to gametes.

Correct Answer: