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Downs syndrome is caused by a genetic mutation called trisomy. Trisomy is when an extra chromosome is present on one set of chromosomes, so instead of the 46 chromosomes of a normal human there are 47. Trisomy can often result in miscarriage as the body cannot cope well with extra chromosomes. Downs syndrome is when there is an extra chromosome 21. Other genetic defects which are caused by trisomy are Edwards syndrome and Patau syndrome.

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12y ago
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9y ago

Down syndrome is caused by the presence of an extra 21st chromosome. Instead of the typical 2 copies, a person with DS will have 3 copies (known as a trisomy).

Down syndrome is not a mutation, but is usually an inherited condition due to the extra genetic material in one of the parents' egg or sperm, whether by Nondisjunction or by Translocation.

Mosaic is a rare form of DS wherein after conception with typical genetic material, an error in cell replication - mitosis- creates some cells with Trisomy 21 and some cells remain typical.

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11y ago

uh... no not at all its a sort of mutation with the gene. the chromosones split up and the red ang green segmet of chromatids switch 1 chromatid

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15y ago

No.

Down syndrome is caused when a person inherits three copies of chromosome 21 instead of two.

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11y ago

NO, it is caused by the Trisomy of the human chromosome 21

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14y ago

An extra chromosome in 21. You're only supposed to have 2 but the disorder causes it to have 3.

Trisomy 21

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15y ago

An extra 21st chromosome.

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