Going down to the cellular level, it occurs in meiosis when chromosomes fail to separate (nondisjuction). We get a set of chromosomes from our paternal side and the other set from out maternal side. For example, one of the gamete that may have came from our maternal side contains no chromosomes , O, when it should contain that chromosome x while from our paternal side we get a gamete containing the x chromosomes. This results in a XO, a sterile female when the normal sex chromosomes are XX or XY.
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nondisjunction
People have Turner syndrome because the second X chromosome is missing from all or some of their cells. This happens randomly at some time during cell division as an embryo/foetus I think. As far as I know, they do not know why the second X is missing. It happens in about 1 in 2,000 live female births.
Nothing 'causes' Turner Syndrome it is simply random genetics
Genetic mosaicism is most often implicated alongside nondidjunction and partial monosomy
Turner syndrome is the deletion of the second X chromosome. As far as I know this is a random event and it is unknown why it happens.
No, it is caused by Nondisjunction. That means the chromosomes didn't separated properly.
I did a research on this topic. It happens every 1 to 2,000 females ONLY.
Only a single sex X chromosome availabiliy
This is not a good question. The Turners Syndrome only occurs in women, and it is not inherited, because these women cannot have their own children. No causes have been discovered yet.
All you ever needed to know about Turners: http://en.wikipedia.org/wiki/Turner_Syndrome
Sometimes the person does not have obvious characteristics of Turner syndrome, so they do not get diagnosed as a child. When they become adolescent and do not go through puberty that is what leads the doctor to test the person for Turner syndrome.
yes
Jacob syndrome, 49XYY, has to occur as a result of nondisjunction in the father. The Jacob Syndrome male would have received the X chromosome from his mother, and both Y chromosomes from the father (since the Y chromosomes can not possibly have come from the mother). Jacob Syndrome can be the result of nondisjunction in meiosis.
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Turner syndrome is a chromosomal disorder.
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This is not a good question. The Turners Syndrome only occurs in women, and it is not inherited, because these women cannot have their own children. No causes have been discovered yet.
Yes animals do sometimes have Turner's syndrome or Klinefelter's syndrome with similar characteristics as those observed in humans.
not a very bad (effective) symptom
it is not inherited because a women with turners sydrome cannot have children so that means that its not inherited
As a 19yr old female with Turner's Syndrome (diagnosed at 8yrs old), have never had any problems in school. There is usually no mental effect, however girls with turners may have problems with spatial problems and possibly math. However, I am in my second year of university, and have received an A in Linear Algebra, and have never had special treatment due to turners syndrome.
No, only the gametes would be indicative of sterility. It is possible that the individual (though incredibly rare) to have "chimera" syndrome, where two non-identical twins merge to form one fetus. Turner's Syndrome is the absence of the male sex chromosome BTW. That chromosome carries little genetic information, and is possible during mitosis to "loose" it, but still create a mostly viable cell.
All you ever needed to know about Turners: http://en.wikipedia.org/wiki/Turner_Syndrome
2% of unborn babies with Turners survive to birth. Babies with Turners who survive to birth live.
Sometimes the person does not have obvious characteristics of Turner syndrome, so they do not get diagnosed as a child. When they become adolescent and do not go through puberty that is what leads the doctor to test the person for Turner syndrome.