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The high frequency of people with sex chromosome aberrations is partly due to the fact that they are rarely lethal conditions. Like Down syndrome and other autosomal problems, sex chromosome gross abnormalities can be diagnosed before birth by amniocentesis and chorionic villi sampling. Sex chromosome abnormalities are gender specific. Sex chromosome abnormalities may be caused by full or partial deletions or duplications of sex chromosomes. Chromosomes are structures within cells that contain DNA and many genes. A gene is a segment of deoxyribonucleic acid (DNA) and contains the code for a specific protein that functions in one or more types of cells in the body (see Genes and Chromosomes for a discussion about genetics). In Down syndrome, 95% of all cases are caused by this event: one cell has two 21st chromosomes instead of one, so the resulting fertilized egg has three 21st .

Down syndrome sex chromosomes
Down syndrome sex chromosomes

Down syndrome is caused by an excess of genetic material. The genetic material is present in every human body cell and is arranged in tiny structures called chromosomes. They are the building blocks which gives us our individual characteristics. They determine the colour Down syndrome sex chromosomes our hair, our eyes and many Down syndrome sex chromosomes characterisitics. Each human body cell contains 23 pairs i. Egg cells and sperm are formed by a special cell division process during which the chromosome pairs divide and only one chromosome of each pair is included in a sex cell.
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