Question

which of the following is a source of heritable variation? mutations mitosis identical twins

Explanation:

Mutations are changes in the DNA sequence. If they occur in germ - cells (sperm or egg cells), they can be passed on to offspring, thus creating heritable variation. Mitosis is a cell - division process that produces genetically identical daughter cells (in somatic cells) and does not create heritable variation. Identical twins are formed from a single fertilized egg that splits, resulting in genetically identical individuals and no new heritable variation.

Answer:

mutations