According to the UN data, the estimated incidence of Down syndrome is between 1 in 1,000 -- 1 in 1,100 live births worldwide.

Aging men often lose the Y chromosome in a growing number of their cells—and it may be far more dangerous than once believed. This loss has been linked to heart disease, cancer, Alzheimer’s, and ...

Human cells have two copies of each chromosome, and this balance is essential for genes to be expressed in the appropriate ...

There is something like less than one chance in 10 billion that this kind of thing could occur," said one expert.

Biologists at the National University of Singapore (NUS) have uncovered how the protein NuSAP safeguards tiny structures inside cells called centrioles, revealing a mechanism linked to developmental ...

New research from Cornell University and the University of Connecticut finds that chromosomal inversions – which occur when a chunk of chromosome containing tens to thousands of genes breaks off, ...

Mosaic Down syndrome has some cells with three copies of chromosome 21, and some with two instead of all three. Only about 1% to 2% of people with Down syndrome have mosaic Down syndrome. The severity ...

Human egg cells are often prone to chromosomal errors. As women age, the error rate increases sharply — and can contribute to infertility, pregnancy loss, and ...

In the wild mountain ranges of Morocco and northeast Algeria, there’s a small, shimmering butterfly that most people have never heard of. It flutters through cedar forests and scrubby hillsides, ...

Scientists have sequenced the genome of the Atlas blue butterfly for the first time and confirmed it holds the highest chromosome number among multicellular animals. The butterfly lives in the ...

Scientists at the Wellcome Sanger Institute and the Institut de Biologia Evolutiva in Spain have sequenced the genome of a female Atlas blue butterfly (Polyommatus atlantica) and found that it has 227 ...