Down syndrome, or trisomy 21, is a genetic disorder where babies have an extra 21st chromosome. Chromosomes are packages of genes that tell the body how to grow. An extra chromosome changes how ...

Most people have two copies of each chromosome, for a total of 46. People with Down syndrome have 3 copies of the 21st chromosome, making a total of 47. Down syndrome is also called Trisomy 21.

AP Penelope was born Oct. 25 with the disorder that is also called Trisomy 21, a reference to a repetition of the 21st chromosome. “This is the first time I can pick a number that’s not just ...

Down syndrome is a chromosomal abnormality that adds an extra chromosome 21 to a baby's normal 46 chromosomes at birth. This extra chromosome causes delays in physical growth, adversely affects ...

who was born with Down syndrome, according to the Major Baseball League. The genetic condition, known as Trisomy 21, results in an extra copy of chromosome 21. A video shared on Instagram by the ...

The clinical name for Down syndrome is trisomy 21, a condition in which a person is born with an extra chromosome, causing mild to moderate cognitive disability, developmental delays and physical ...

Down Syndrome is also known as Trisomy 21, a repetition of the 21st chromosome. Burger said he and wife Ashlyn are expected to announce a foundation for Trisomy 21 research and support in the near ...