A century after Down syndrome was first described ... were able to identify a supernumerary copy of chromosome 21 in karyotypes prepared from DS patients (Figure 2). Trisomy 21 is now accepted ...

The three wiggly copies of the 21st chromosome that appeared in a karyotype offered visual proof. I am grateful that my ...

HHMI researchers devise prenatal blood test that accurately detects Down syndrome and two other serious chromosomal defects. Howard Hughes Medical Institute researchers have developed a new prenatal ...

A genetic screen can potentially diagnose more than 1,200 genetic disorders and chromosomal abnormalities. If you were a medical geneticist, how would you pick the best test for your patient ...

Physical traits and a chromosomal analysis (karyotype test) help confirm the diagnosis after birth. * Maternal age: Women over 35 have a higher risk of having a baby with Down syndrome.