syndrome is a rare genetic disease that occurs in about 1 in every 20,000 births and is characterized by an absence of genetic material on the seventh pair of chromosomes.

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Williams syndrome is characterized by the deletion of genetic material on chromosome 7, leading to a variety of developmental and physical issues. Down syndrome is caused by an extra copy of chromosome 21, and Fragile X syndrome is related to a mutation on the X chromosome.

Syndrome Is a Rare Genetic Disease That Occurs in About