The extra 21^st chromosome that is found with Down syndrome usually comes from the father's sperm.

Name: The extra 21 st chromosome that is found with Down syndrome usually comes from the father's sperm.
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The extra chromosome 21 in Down syndrome usually comes from the mother's egg, not the father's sperm. This occurs due to a process called nondisjunction during cell division, where the egg or sperm cell fails to separate properly, resulting in an extra chromosome.

The Extra 21st Chromosome That Is Found with Down Syndrome

The Extra 21^st Chromosome That Is Found with Down Syndrome