For an individual to have Down syndrome,one of the gametes had to have contained 24 chromosomes.

Name: For an individual to have Down syndrome,one of the gametes had to have contained 24 chromosomes.
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Down syndrome, also known as trisomy 21, results from the presence of an extra copy of chromosome 21, which can only occur if one of the gametes (either the sperm or egg) has 24 chromosomes instead of the usual 23.

For an Individual to Have Down Syndrome,one of the Gametes