Can you have 45 chromosomes

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Advanced search. Skip to main content Thank you for visiting nature. Download PDF. Summary A case of Down syndrome with 45 chromosomes was presented.

References Dutrillaux, B. Google Scholar Emberger, J. Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references National Library of Medicine. Turner syndrome. Genetics Home Reference.

Accessed July 5, Learning about Turner syndrome. National Human Genome Research Institute. National Organization for Rare Disorders. Merck Manual Professional Version.

Backeljauw P. Clinical manifestations and diagnosis of Turner syndrome. Management of Turner syndrome. These changes can occur during the formation of reproductive cells eggs and sperm , in early fetal development, or in any cell after birth. A gain or loss in the number of chromosomes from the normal 46 is called aneuploidy.

A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells. Down syndrome also known as trisomy 21 is an example of a condition caused by trisomy. People with Down syndrome typically have three copies of chromosome 21 in each cell, for a total of 47 chromosomes per cell. Monosomy, or the loss of one chromosome in cells, is another kind of aneuploidy.

Turner syndrome also known as monosomy X is a condition caused by monosomy. Women with Turner syndrome usually have only one copy of the X chromosome in every cell, for a total of 45 chromosomes per cell. Rarely, some cells end up with complete extra sets of chromosomes. Cells with one additional set of chromosomes, for a total of 69 chromosomes, are called triploid.

Read more about treating Turner syndrome. You can opt out of the register at any time. Page last reviewed: 07 July Next review due: 07 July Characteristics of Turner syndrome Females with Turner syndrome often have a wide range of symptoms and some distinctive characteristics. Almost all girls with Turner syndrome: are shorter than average have underdeveloped ovaries, resulting in a lack of monthly periods and infertility As height and sexual development are the 2 main things affected, Turner syndrome may not be diagnosed until a girl fails to show sexual development associated with puberty , usually between the ages of 8 and 14 years.