Small cell tumors press against a large blood vessel near the lungs called the superior vena cava
Klinefelter's syndrome is not considered to be a variation of normal, so by definition it is abnormal.
Down's Syndrome is an example of a birth defect characterized by an abnormality of the chromosome structure.
no, it is a chromosomal abnormality, not a contagious disease.
Turner's syndrome was first described by Dr. Henry Turner in 1938, but it was not until 1960 that the chromosomal abnormality was discovered. ...
The discovery of the 47 XYY syndrome was first reported by Patricia A. Jacobs and J.A. Strong in 1961. They described a male with an extra Y chromosome, leading to the identification of this chromosomal abnormality.
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It is called Patau syndrome and is a chromosomal abnormality
The most common chromosomal abnormality in humans is Down syndrome, which is caused by an extra copy of chromosome 21. It occurs in about 1 in 700 births.
Mental retardation may be caused by an inherited abnormality of the genes, such as fragile X syndrome.
Down's Syndrome or trisomy 21.
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Patau syndrome was first described by Dr. Klaus Patau in 1960.