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Down syndrome human karyotype 47,XY,+21
- Wessex Reg. Genetics Centre
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Credit: Down syndrome human karyotype 47,XY,+21.
Credit: Wessex Reg. Genetics Centre.
Attribution 4.0 International (CC BY 4.0)
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Description
Down syndrome karyotype (formerly called trisomy
21 syndrome or mongolism), human male, 47,XY,+21.
This male has a full chromosome complement plus an
extra chromosome 21. Symptoms include a varying
degree of mental retardation, growth failure,
muscular hypotoicity, flay occiput, large tongue,
slanting eyesm, simian palmar crease, intestinal
and heart problems, and acute leukaemia. Older
survivors often develop Alzheimer's disease in
their fourth or fifth decade. The syndrome is
associated with advanced maternal age.
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