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Does turner's syndrome occur in all cells?
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.
Can a girl with a karyotype of 46XX still be diagnosed with Turners?
No, individuals with Turner syndrome typically have a karyotype of 45X. If a girl has a karyotype of 46XX, she would not be diagnosed with Turner syndrome.
What is the etiology of marfan syndrome?
The etiology of marfan syndrome would be the mutations in the protein FBN1 in the gene chromosome 15.
What is the genetic cause of Down syndrome?
Both syndrome's indicate the presence of a 47th chromosome (or extra part of a chromosome). Most humans have 23 pairs of chromosomes, totaling 46 chromosomes. For Down's syndrome, the 47th chromosome appears with the 21st pairing. For Klinefelter's syndrome the 47th chromosome appears with the 26th pairing (the gender chromosomes.)
Which of the following are example(s) of trisomy---Turner Syndrome Down's Syndrome or Klinefelter's Syndrome?
Trisomy means having three copies of a chromosomes. Turner's syndrome is NOT an example of trisomy. Someone with Turner's syndrome has only one X chromosome. Down's syndrome IS an example of trisomy. Someone with Down's syndrome has 3 copies of chromosome 21. Klinefelter's syndrome is a tricky one. On one hand, it would be considered trisomy because they have 3 sex chromosomes. However, they are not all the SAME sex chromosomes. Someone with Klinefelter's has 2 X chromosomes and one Y chromosome.
What is a genetic disorder that can be detected by karyotyping?
Down's syndrome is one that can be detected, in this disorder the person has one extra chromosome. This chromosome failed to separate during cell divisoin which resulted in a gamete having 24 chromosomes instead of 23. A person with downs syndrome has 47 chromosomes which can be observed by karyotyping.Another in turner's syndrom, in only occurs on the X chromosome and it results in a female missing or having an abnormal X chromosome. In karyotyping you will see that the female only has one X chromosome. It can not occur in males because they only have one X chromosome and a Y chromosome can not survive by it self.Klinefelter's Syndrome is when a male has an extra X chromosome. So he will have XXY (47 chromosomes) this is also detected in karyotyping.Karyotyping is a test to examine chromosomes in a sample of cells, which can help identify genetic problems. They can also be used to study chromosomal aberrations, cellular function, and gather information past evolutionary events.
Why does some people only have 45 chromosomes?
Well down syndrome is causes by the 21st chromosome of a sex cell doubling, and so once fertilisation with the egg commences there will be 3 21st chromosomes. When you have 45 their is multiple things that can happen, the only consistent one is Turner Syndrome, which basically stunts puberty. This only happens in females and it is when they have X instead of XX.
Describe how the karyotype of an XXY human would differ from that of an XO human?
The karyotype of an XO human would be deficient one X chromosome, compared to that of a normal female, and it would result in a female. Normal human females only use one X chromosome, whereby one is inactivated, which is why an XO human is viable. An XXY human would have one extra X chromosome as compared to that of a normal male, and it would result in a male. Again, an X chromosome is inactivated, which is why an XXY human is viable. XO is referred to as Turner Syndrome. XXY is referred to as Klinefelter Syndrome.
A karyotype would be unable to Turner syndrome?
A karyotype can detect Turner syndrome by revealing a single X chromosome in females (45,X). This genetic condition is characterized by the absence of one X chromosome, which is visible on a karyotype analysis.
Since it is possible to have identical twins of different genders could there be a nondisjunction in the sex chromosomes causing one twin to have Turners syndrome and the other to have Kleinfelters?
No, it is not possible for identical twins to have different sex chromosome conditions like Turner syndrome and Klinefelter syndrome. Identical twins develop from a single fertilized egg, so they have the same genetic material, including the sex chromosomes. If there was a nondisjunction event in one twin leading to an abnormal number of sex chromosomes, it would affect both twins, not just one.
Is Barr body present in female with Down syndrome?
Yes, a female with Down syndrome has three copies of chromosome 21, but only two copies of the X chromosome. Regarding sex chromosomes, she is genetically normal. For this reason X chromosome inactivation would occur, and she would have one Barr body per cell.
People with down syndrome have how many chromosomes?
47There are 47 chromosomes in someone with Down syndrome; the 21st pair has an extra chromosome. Most people have 46 chromosomes. Down syndrome is also known as "Trisomy 21" - a reference to the fact that someone with Down syndrome has 3 pairs of chromosomes on their 21st pair.
