What happens to cause a female to begin puberty? apex?

For a girl to start puberty there is a release of hormones that influence various changes in her body.

Explanation:

Around the age of 8, in a girl's body, the hypothalamus releases a hormone called gonadotropin (GnRH), which goes to the pituitary gland. It triggers the production of two other hormones: luteinizing (LH) and follicle stimulating (FSH). They stimulate the ovaries to make estrogen and progesterone. That way, girls' puberty begins.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

cell regulation is conducted by special proteins.