is/are there any disorder called chimera wherein there's 2 DNA in a single body? If so how can this happen?
95015
This has to do with the genes one conveys in the basic human cell, or rather the human blue print: DNA.\nA chimera is a mixture of two or more species in one body, not all are considered troubling, though.\nScientists have begun blurring the line between human and animal by producing chimeras—a hybrid creature that's part human, part animal. \nBasicaly what I mean is that this is the implant of different genes in one organism but basicly with the concept of hybridisation (interbreeding to achieve desired qualities).
986360
yes.\npeople conceived as 1 of a set of twins, \n1 twin at the egg stage absorbs their twin.\nit's rare but yes it does & can happen.\nthey're born with 2 sets of dna.\ncarrying 1 type in their secreted fluids, but a different type in their marrow.
463778
"The case of a young man with del(2) (p11.2p13) is reported. Accounts of previous cases of deletion of the short arm of chromosome 2 are reviewed. Common features include mental retardation, proportional short stature and weight, dysmorphic facial features (a prominent nose, abnormal ears), and abnormal hands. Growth and developmental delay are present during the postnatal period"\n\nhttp://jmg.bmjjournals.com/cgi/content/abstract/30/7/604
917555
It's not a mutation, per se, because it doesn't involve a change in the DNA, just a malfunction in the production of germ cells.  What disease it is depends on which chromosome you're talking about.\n\n- Down Syndrome is an extra copy of chromosome 21.  This is the most frequent extra chromosome aberration in the population.\n- Edward's Syndrome is an extra copy of chromosome 18.  This is the second most frequent.\n- Patau Syndrome is an extra copy of chromosome 13.\n- Klinefelter's Syndrome occurs in men with two X chromosomes and one Y.\n- XYY Syndrome is (obviously) a man with an extra Y.\n- XXX Syndrome is a woman with an extra X.  (And has nothing to do with Vin Diesel).\n\nI'm sure there are more, but they start to become really, really rare.  I'd provide links for all those diseases, but there's so many of them!  Hope that helps!
84693
So in short, sister chromatid are duplicates of the homologous pairs. I hope this helped If so 333 (I) would like the 10 points. :)\n\nThe normal chromosome number in human cells is 46. This number is called a diploid or a 2n number of chromosomes. The chromosomes consist of 23 pairs. Each pair of chromosomes is called a homologous pair. One chromosome of each homologous pair is from the male parent, and the other is from the female parent. The chromosomes of each homologous pair look alike, and they contain genes for the same traits. \n\nSister chromatids are two identical copies of a single chromosome that are connected by a centromere. \n\nFirst, consider mitosis (typical cell division) in a normal diploid cell, with two copies of each chromosome. The chromosomes are duplicated during DNA replication, and the duplicates, called sister chromatids, remain attached to one another until chromosome segregation. Each daughter cell then receives one of the sisters from each homologue pair. Importantly, this means that the daughter cells are exact copies of the mother cell, with two copies of each chromosome, so they can go through the same process again. Thus, we call this process the cell cycle.
226072
Chromosome 4 RingChromosome 4 Ring is a rare disorder that is typically characterized by loss (deletion) of genetic material from both ends of the fourth chromosome & joining of the chromosomal ends to form a ring.\n\n \nGeneral Discussion \n\nChromosome 4 Ring is a rare disorder that is typically characterized by loss (deletion) of genetic material from both ends of the 4th chromosome and joining of the chromosomal ends to form a ring. Associated symptoms and findings may vary greatly, depending on the location of lost genetic material and/or other factors. Some affected infants may have a low birth weight; growth retardation; delays in the acquisition of skills requiring the coordination of mental and physical activities (psychomotor retardation); an abnormally small head (microcephaly); a broad, "beaked" nose; and/or various additional physical abnormalities that are present at birth (congenital anomalies). However, cases have also been reported in which Chromosome 4 Ring is primarily associated with growth retardation, with no major physical anomalies and normal psychomotor development. Chromosome 4 Ring is usually caused by spontaneous (de novo) errors very early in the development of the embryo that appear to occur randomly for unknown reasons (sporadically).\n\n.\n\nResources \n\nChildren's Craniofacial Association \n\n13140 Coit Road\n\nSuite 307\n\nDallas, TX 75240\n\nUSA\n\nTel: 2145709099\n\nFax: 2145708811\n\nTel: 8005353643\n\nEmail: csmith@ccakids.com\n\nInternet: http://www.ccakids.com\n\n\n\nMarch of Dimes Birth Defects Foundation\n\n1275 Mamaroneck Avenue\n\nWhite Plains, NY 10605\n\nTel: (914)428-7100\n\nFax: (914)997-4763\n\nTel: (888)663-4637\n\nEmail: Askus@marchofdimes.com\n\nInternet: http://www.marchofdimes.com\n\n\n\nThe Arc (a national organization on mental retardation)\n\n1010 Wayne Ave\n\nSuite 650\n\nSilver Spring, MD 20910\n\nTel: (301)565-3842\n\nFax: (301)565-3843\n\nTel: (800)433-5255\n\nTDD: (817)277-0553\n\nEmail: info@thearc.org\n\nInternet: http://www.thearc.org/
616348
I have a friend who has quadruplets.\n\n3 girls and a boy.\n\nShe had AFI - and they implanted 3 eggs.  One egg split, creating idential twins.  There are 3 girls and 1 boy.  Two girls are identical, and the other two look different.
22157
It is spelled: Chimera. It is the term used for organ transplants, especially from a different species e.g. Pig coronary valve transplanted to a human. The term comes from greek mythology in which the chimera was a monster with the body of a lion, head of a goat and tail of a serpent.
183355
Chromosomal DNA is what determines who we are as individuals.  There are 23 pairs of choromosomes.  There are 22 pairs of autosomes which are alike in male and females and then thereis one pair of sex chromosomes.  XX is female.  XY is male.
615086
All genetical disease in homo sapiens:\n-cystic fibrosis.\n-Ataxia talangiectasia.\n-type II Diabetis melitus.\n-phenylketonuria.\n-goiter. (hyperthypoidism)\n-All types of cancer. (caused by a DNA adduct that affect normal genomic replication)\n\nmutations occures everywhere, and many think that mutation can lead to the creation of new species.\nlike those silly that said: human is the cause of chimpanze development.\na study is made about this dilemma, they found that for all mutation to occur (and they will occure in a probabily less that 0.0002%) they need more than 6,000,000 trilion years to accomplish this transformation.\nSo of course this is not true since it's exceeds the age of earth. maybe they are mutated in some where else and they are sent to earth after it's development by an ultra-lightspeed voyager. :-D
73114
There is about a 1 in 10 billion chance that someone would have the same dna as you, unless you have an identical twin.  Scienctists don't like to say "never", but that's really close.
648287
First of all, I'm a mental health professional with 15 years experience.  I want to dispell one myth right now.  Shizophrenia has nothing to do with two personalities.  With that said, Multiple personality disorder or as it is also called DID, is a fairly rare condition that should only be diagnosed by a very experienced and qualified practitioner.
722229
I am only a first year med student, but your topic interested me and I spent some time researching it.\n\nIt can also be called PNH (periventricular nodular heterotopia) or just PH. The most common form of the disease results from a mutation in a gene on the FLN-1 gene on the X chromosome.  What is odd is that it is a X-linked dominant mutation (most of what you hear with the X chromosome is recessive).  This means that either:\n\n-The mother of the child had it and passed it on\n-That a spontaneous mutation occured while the DNA of the egg was being copied.  (A baby girl who is born has already copied all the DNA for her future children, so it was nothing a mother could have affected through lifestyle)\n-A third option is that it is caused by something called "somatic mosaicism".  This is a difficult topic to explain.  It means that while the embryo was multipling and copying its DNA, a mutation occured in this gene just randomly.  Therefore every cell that comes afterward from this cell is also affected.  This means that if the mutation occured early, a lot of cells would be affected.  It it occured later in the embryo, less cells would be affected.  A 1999 article I read said that this was the generally accepted view on males with PH.   \nI also read that they generally see this disease in baby girls, because boys with the mutation rarely survive to term birth and are often miscarried.  Females have two X chromosomes and thus the other "normal" X chromosome must have some protective effect.  \nThe gene makes a protein that is important for the migration of neurons during embyrogenesis.  With this malfunctioning protein the neurons did not migrate properly during while in gestation (in the mother's womb).  \nI read a lot about epilepsy (seizures) being associated with PH (actually 80% according to two articles I read).\nI also read that the levels of mental retardation can be vary a lot (which is very much in line with the idea of somatic mosaicism = varying degrees of pathology depending on which types of cells have the mutation and which don't).  There are some reported to have no mental retardation.  \nI was not able to find any support groups for your son's condition which is critical for further information.  I would recommend that your son be seen by a pediatric neurologist if he has not seen on yet (though I would assume he has).\nFinally, I did find a web site that tries to confidentially try to link up families that have similar genetic conditions that there are no support groups for.  This issue is about Angelman's syndrome but if you go to the bottom of the "Links Line" there is a family with an 11 year old son with the condition that would like to talk to others.  There is a contact person at the bottom.\n\nhttp://www.geneticsupportcouncil.org.au/uploads/pdfs/Gene%20Advocate%20Edition%2026%20June%202004_364.pdf\n\nHope this all helps.  I am still an eager first year medical student and I have sympathy for your family since I have three daughters of my own.
1059733
http://en.wikipedia.org/wiki/Chimerism
260970
Yes, it is XYY and it is uncommon.  However, if you have this abnormality, you are unlikely to ever know it.  The tendency to violence with this abnormality is largely discredited, most evidence shows no abnormal tendencies in these people.  See the website below for more information and read the special chapter in the referenced book for an even more fascinating analysis of this question.\n\nEdit:\nI have looked into it a bit more and have found that the name of the condition is Jacobs Syndrome.  As to the question about whether it is possible, it certainly is possible.  It happens during meiosis II, when there is nondisjunction of sister chromatids of the Y chromosome, resulting in both sister chromatids in one cell and none in the other cell.  Nondisjunction means that the chromatids are normally supposed to split apart, one going into each cell, but that doesn't happen.
190426
Interesting question.  I hadn't even thought of this question yet.  True, there is/are NO definitive cause/s of Autism.  Recent studies studies are showing, however, possible genetic links.  More studies are being done because more and more siblings, of people with Autism, are being born on the spectrum, or with closely related developmental disorders.  These recent studies show changes in ALL chromosomes...not just one as found in other disorders like Downs.  Remember, though, NOTHING definitive at this point.\n\nMy intuition tells me that it is possible for an adult with Autism to have a child who is also on the spectrum.  I see too many families with multiple children on the spectrum.  I see twins who both have it.  There is something genetic...there just has to be.  What are the chances in numbers?  I wish I, or anyone else, could say.  Best of luck!
1053947
no, because it is a defect on human chromosome 21, where 3 copies are made instead of 2. this has never been seen to occur in the genomes of other organisms.