Here's why:

* Germ cells: These are the cells that give rise to sperm and eggs.

* Mutations in germ cells: Any mutation that occurs in a germ cell can be passed down to offspring.

* Inheritance: When a sperm or egg carrying a mutation fertilizes, the mutation becomes part of the fertilized egg's genetic makeup. This means every cell in the developing child will carry the mutation.

Examples of inherited cell mutations:

* BRCA1 and BRCA2 mutations: These genes are involved in DNA repair, and mutations in these genes increase the risk of breast, ovarian, and other cancers.

* Cystic fibrosis: This is a genetic disorder caused by a mutation in the CFTR gene.

* Huntington's disease: This is a neurodegenerative disease caused by a mutation in the HTT gene.

Important note: Not all mutations are inherited. Somatic mutations occur in other cells of the body and are not passed on to offspring.