Question

sexual reproduction of organisms​

Answer 1

Sexual reproduction is a kind of life cycle where generations alternate between cells with a single set of chromosomes (haploid) and cells with a double set of chromosomes (diploid).[1] Sexual reproduction is by far the most common life cycle in eukaryotes, for example animals and plants.

Diploid cells divide into haploid cells in a process called meiosis. Two haploid cells combine into one diploid cell in a process called fertilisation. Between fertilisation and meiosis there can be a large number of cell divisions without change of the number of chromosomes