Biology, 23.07.2020 07:01, tae8002001

A diploid human cell normally has 23 pairs of homologous chromosomes, but as a woman ages, the chances of nondisjunction increase. Imagine that a gamete is produced that received two copies of chromosome 21 due to nondisjunction during meiosis II. If the gamete is fertilized with a normal sperm, the embryo's cells will contain chromosomes.

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A diploid human cell normally has 23 pairs of homologous chromosomes, but as a woman ages, the chanc...