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What causes the abnormality in chromosome numbers in people with down syndrome?
Wiki User
∙ 11y ago
It is most commonly caused by increased maternal age.
Add: It is the result of nondisjunction of the 21st chromosome pair, in which the pair fails to separate, so that one cell gets an extra copy of chromosome 21.
Wiki User
∙ 11y ago
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What abnormality has Philadelphia chromosome possess?
The Philadelphia chromosome abnormality is that chromosome 9 and 22 have swapped places. This abnormality causes a higher susceptibility to forms of leukemia. Specificly it is connected most commonly to chronic myelogenous leukemia.
What are the causes of heredity diseases?
The causes of a hereditary disease is a missing chromosome, and extra chromosome. Like in Down Syndrome there is an extra chromosome 26.
Can X-Ray exposure cause abnormalities like Down syndrome?
Down syndrome is caused by a genetic abnormality in Chromosome 21. It is highly unlikely that X-Ray exposure causes genetic abnormalities such as this. However, X-Rays are not recommended while pregnant.
What is crying cat syndrome?
Cri du chat (French for "cry of the cat" or "cat's cry") syndrome is a rare genetic defect in humans. It is caused by a deletion of the short arrn of chromosome 5 (called 5p). Babies with this syndrome often have a characteristic high-pitched cry that sounds like a cat. Jérôme Lejeune discovered the cause of cri du chat syndrome in 1964. Five years previously, he had discovered the chromosome abnormality that causes Down syndrome in humans.
What chromosomal abnormality causes Klinefelter syndrome?
46,XXY or XXY for males; see the link below.
What causes Deletion Syndrome?
deletion syndrome is a disorder caused by the deletion of a small piece of chromosome 22. The deletion occurs near the middle of the chromosome at a location designated q11.2.
What chromosomal abnormality causes Turner syndrome?
If one of sex chromosomes is missing. Normal-XX Turner- XO
What trisomy causes Down syndrome?
Down syndrome is caused by the presence of a third chromosome 21
What type of mutation causes Edwards' syndrome?
An extra copy of Chromosome 18
Is the extra copy of Chromosome 21 that causes Down syndrome dominant or recessive?
Down syndrome is neither caused by dominant or recessive chromosomes it is simply caused by an error in the translation process of chromosome 21.
Which process could result in the type of cell mutation that causes Down syndrome?
Down's syndrome is caused by trisomy of the 21st chromosome. This is mostly caused when the chromosome pair fails to separate properly (nondisjunction).
What causes disorders such as klinefelter syndrome and turner syndrome?
Klinefelter syndrome is a chromosomal condition that only affects males and is characterized by a male having an additional X chromosome (XXY) in cells. This chromosome abnormality occurs when there is an error in cell division, resulting in an extra copy of the X chromosome.
