As seen in the venn diagram, meiosis is responsible for the production of haploid gametes. somatic or body cells are 2n cells. this change in chromosome number is the result of
a. mitosis.
b. fertilization.
c. differentiation.
d. growth and development.

This change in chromosome number is the result of B. Fertilization. Both of the individual gametes from the male and female combine together to produce a zygote or developing offspring that is diploid in most cases, and possess both sets of genetic content or chromosomal information, one from each parent.

The answer is option b.