Male Down's syndrome karyotype. A karyotype is the complete set of chromosomes of an organism. Humans usually have 46 chromosomes in total,arranged into 23 pairs. Down's syndrome,also called trisomy 21,is caused by the presence of three copies of chromosome 21. Down's syndrome results in mental retardation and flattened facial features. The sex chromosomes,which determine the individual's gender,are at bottom right. Males have an X and a Y sex chromosome,females have two X sex chromosomes | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Look At Sciences |
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