Down syndrome, the most frequent birth defect (around 1/700 births), results in most cases from the presence in all cells of an extra copy of chromosome 21. It is characterized by a complex and ...

1 in 1,000 to 1 in 1,100 live births worldwide are children born with down syndrome. The United Nations notes that each year, approximately 3,000 to 5,000 children are born with this chromosome ...

Chromosome 21 is the smallest human chromosome, and procedures for examining human chromosomes were still being developed during the first part of the century. Many early cytologists had ...

World Down Syndrome Day: Down syndrome appears as a genetic disorder following abnormal cellular division which results in either an entire or partial additional chromosome 21. The body and brain ...

This story was excerpted from Kennedi Landry’s Rangers Beat newsletter. To read the full newsletter, click here. And ...

is your neighborhood reporter for the Westside. Down syndrome is a genetic condition where a person is born with an extra copy of chromosome 21. This results in developmental delays and may come ...