A mutation in which types of cells would only affect the organism and not future generations

Answer;

Somatic mutations

Explanation; Somatic mutations are mutations that occur in body cells, that is the cells that do not make gametes. These mutations are not passed on to further generations; for example, if a mutation that changes a gene in a skin cell would not affect your children because skin cells don't produce gametes. Germ mutations on the other hand are mutation that occur in gametes or the cells that form gametes. These mutations may not affect the organisms in which they occur, but they can affect the future generations, if an offspring develops from a mutated gamete.