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Biology 24 Online
OpenStudy (anonymous):

Could there be a 24th chromosome in the human body?

OpenStudy (anonymous):

Nope, there are only 23 pairs of chromosomes. But I'm not very sure, that might happen due to genetic disorders.

OpenStudy (anonymous):

There are examples of extra chromosomes as pratu043 suggests - Down's syndrome occurs when 3 copies of chromosome 21 are present in the embryo (and hence in all the cells of the adult). This is known as trisomy 21. Other conditions include extra sex chromosomes - people can be XXY or XYY as a result of a genetic abnormality.

OpenStudy (anonymous):

it can turnes as well in which ther is deficiency of 1chromosome

OpenStudy (anonymous):

The geek is right - individuals with Turner's syndrome have only one X chromosome.

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