Down's syndrome. A seven year old boy with Down's syndrome and impaired hearing using sign language. Down's syndrome results from a chromosomal abnormality; each body cell contains an extra chromosome (number 21) so that there are 47 chromosomes rather than the usual 46. This results in a variable mental handicap; IQ usually lies between 30 and 80 (almost all affected children have learning potential),and distinctive appearance with upward-sloping eyes. Heart defects,congenital deafness and leukaemia are more common in people with Down's syndrome. About one in 650 babies shows this abnormality & this rate increases with increased maternal age | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Young, Hattie |
Bildgröße: | 3543 px × 2643 px |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |