The diploid cell undergoes meiosis to produce haploid cells.
during prophase I of meiosis homologous chromosomes pair up and exchange genetic material between non-sister chromatids, this is called recombination and paired homologous chromosomes align at the metaphase plate such that any one of the chromosomes from the homologous pair can be separated to one pole, the homologous chromosomes are separated during anaphase I, alleles of a gene are located on the homologous chromosomes since homologous chromosomes are separated during meiosis I, alleles are segregated during meiosis I.
meiosis occurs in both sexes to produce gametes.
so the answer is a) sex
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