Photograph of a karyotype - the collection of chromosomes within each cell of an organism - from a male mouse engineered by Johns Hopkins Medicine researchers to model Down syndrome in a human.

Traits as diverse as the color of a person's eyes and the scent of a rose are determined by the information contained in DNA. Learn how this information is coded by strings of molecules called ...

images of the individual chromosomes are arranged into a standardized format known as a karyotype, or more precisely, a karyogram (Figure 1a-c). According to international conventions, human ...