50.2 MB (310.4 KB compressed)
5177 x 3390 pixels
43.9 x 28.7 cm ⏐ 17.3 x 11.3 in (300dpi)
PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Light micrograph of the chromosomes (karyotype, with G banding) of a male with Down's syndrome. Humans have 46 chromosomes arranged in 23 pairs. Down's syndrome (trisomy 21) is caused by three copies of chromosome 21; a male has one X and one Y sex chromosomes. Down's syndrome results in mental retardation and flattened facial features.
Model release not required. Property release not required.