Mendel's law of segregation is basically that each of an organism's gametes (egg or sperm cell in the case of humans) receives

This phenomenon is explained by the process of meiosis. In this process, only one CHROMOSOME from each homologous pair goes into each gamete. The important point is that each of the two chromosomes in a homologous pair contain only ONE of the two alleles of a gene. Since the gamete only receives one CHROMOSOME out of each pair, it will therefore only receive one ALLELE out of each pair.
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