What happens if you are missing a chormasone

Question

I know downs syndrome is an extra chromosone but what conditons are caused by missing one?

Answer 1

THESE DISEASES CAN BE CAUSED BY MISSING CHROMOSOMES

s*x Chromosome Conditions

s*x chromosome defects: There are various defects of the s*x chromosomes. Normally a man has XY and a woman XX. But the wrong combinations can arise with extra s*x chromosomes or missing ones:

    * Turner syndrome (XO syndrome, monosomy X, missing Y): This should just be called the "X syndrome" because the person has an X, but no second s*x chromosome. Such people are female, as there is no male Y chromosome. It is a 1-in-5000 syndrome, involving some relatively minor conditions, but usually sterility.

    * Klinefelter syndrome (XXY syndrome, also rarely XXXY): a 1-in-1000 disorder where the person is usually male (because of the Y chromosome), but has lower levels of testosterone and may have some female-like features (because there are two X chromosomes), and is usually sterile. The rarer XXXY syndrome may lead to retardation.

    * Jacobs syndrome (XYY syndrome): The person has an extra Y male chromosome. He will be male and may be largely normal, or may suffer from minor features such as excess acne and may be very tall, and in some cases behavioral complaints such as aggression. Frequency around 1-in-2000.

    * Triple-X (x*x, also XXXX or XXXXX): These people are females with an additional X chromosome. In rarer cases, there can even be 4 or 5 X chromasomes. They can be largely normal, or may suffer from problems such as infertility (some but not all), and reduced mental acuity. Occurs with a frequency around 1-in-700.

Note that there is no ordering, and XYX would be the same as XXY.

So there are viable combinations: XX (male), XY (female), XXY (Klinefelter), x*x, XYY, and XO (Turner). They all contain the X chromasome. Interestingly, there has been no combinations found that contain only Y: YO (Y, missing X), YY, or YYY syndromes. Not even aborted fetal embryo cells with this combination have been found. It has been suggested that there is something fundamental on the X chromasome that is needed for life.

Autosomal Trisomy Chromosome Diseases

The 22 non-s*x autosome chromasomes (autosomes) can also exhibit disorders, of which the most common is trisomy (having 3 copies rather than a pair). Because these are disorders of the autosomes and not the s*x chromasomes, these disorders can occur with males or females. These chromosome diseases arise rather surprisingly from an extra copy of the DNA, which makes you wonder why having 3 copies of the code bad even when the DNA code on the extra chromosome is actually correct. The condition of having 3 chromosomes is called trisomy and the most common example for autosomes is Down syndrome.

( from internet lost link)

ONE CHROMASOME

Othera listed above

XX male syndrome is a rare disorder, where the SRY region of the Y chromosome has recombined to be located on one of the X chromosomes. As a result, the XX combination after fertilization has the same effect as a XY combination, resulting in a male. However, the other genes of the X chromosome cause feminization as well.

Other

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http://en.wikipedia.org/wiki/X-chromosom...

Here is some details about particular autosome disorders:

    * Down syndrome (trisomy 21): an extra autosome creating a triplet at chromsome 21. These people are usually mentally retarded, and have physical characteristics such as an enlarged tongue and rounded flattened facial features. Frequency is around 1-in-800 but risk increases with the age of the mother to around 1-in-25 for a 45-year-old mother. The extra chromasome occurs because the mother's egg (or less commonly father's sperm) has wrongly kept both of its autosome 21 pair.

    * Edwards syndrome (trisomy 18): an extra autosome at chromasome 18. Most fetuses are aborted before term, but a live birth with this condition occurs with a frequency around 1-in-3000. Edwards syndrome is more severe than Down's syndrome, and includes mental retardation and numerous physical defects that often cause an early death.

    * Patau syndrome (trisomy 13): a very severe disorder leading to mental retardation and physical defects, occurring with a frequency around 1-in-5000. It is so severe that many babies die soon after birth. Other

XX male syndrome is a rare disorder, where the SRY region of the Y chromosome has recombined to be located on one of the X chromosomes. As a result, the XX combination after fertilization has the same effect as a XY combination, resulting in a male. However, the other genes of the X chromosome cause feminization as well.

http://en.wikipedia.org/wiki/X-chromosom...

Answer 2

As novangelis has said, Turner syndrome is a single X chromosome. Other monosomies are invariably fatal before birth. Down syndrome (chromosome 21) is one of the few trisomies that results in a viable birth, the others are Patau (chromosome 13) and Edwards (chromosome 18) syndromes (both of the latter result in early death or still birth).

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Answer 3

Turner's syndrome is an X chromosome with no other s*x chromosomes.  All other total chromosomal deletions are lethal.  Some segmental deletions are characterized.  Cri du chat syndrome is the loss of a segment on chromosome 5.  Several other partial deletions are characterized.

Answer 4

downsyndrom, and other mental disorders.

Answer 5

Isn't Down Syndrome a possible result? Or maybe it's a extra one?...well it's a possibility.