What are the/some causes of conjoined twins?
153787
-Conjoined twins are twins whose bodies are joined together at birth. This happens where the zygote of identical twins fails to completely separate.  A zygote (Greek: ζυγωτόν) is a cell that is the result of fertilization. That is, two haploid cells—usually (but not always) an ovum from a female and a sperm cell from a male—merge into a single diploid cell called the zygote (or zygocyte).
166728
There is no known single cause of schizophrenia. Genetics play a huge part.  Statistically if a parent has the disorder their children have a 10% chance of developing it.  If one identical twin has schizophrenia the chances for the other twin jump to 40-50%.  Another cause can be where the fetus did not receive enough nutrients from the mother leading to the brain not developing properly.  Viral infections also play a role in the disorder.
63174
There are two types of twins- fraternal and identical.  Identical twins occur when one egg which is fertilized by one sperm, splits.  Fraternal twins occur when 2 seperate eggs are fertilized by two seperate sperm.
194724
Yep, born in one. Three weeks later back for a double hernia operation, common in males at that age. Not more than a month old and I was there two times.   ;)
91404
Insulin resistance, excessive androgen production, hypothyroidism, hyperprolactinemia, cushings disease.  I think I read that it is also caused from a genetic mutation Syndrome X.  Not for sure on the last one.
843595
The children will not be "twins" (they will likely not look the same, though they may look similar in the way siblings do). This is because during meiosis, the genes in each haploid are random, from both parents.\n\nFor example, if both twin brothers had a dominant gene for black eyes and a recessive gene for green eyes, one twin might pass on a black eye gene to his child, while the other might pass on a green eye gene.
1065164
The cells from two separate eggs (twins) can combine into one whilst in the mother's womb - thus one child is born but has two dna's instead of one
631350
There are multiple causes for primary amenorrhea once pregnancy, lactation and missed abortion are ruled out. These include:\n• anorexia nervosa/bulimia/malnutrition\n• extreme obesity\n• hyperthyroidism/hypoglycemia\n• congenital heart disease\n• cystic fibrosis/Crohn’s disease\n• genetic abnormalities\n• obstructions: imperforate hymen/vaginal or cervical absence\n• ovarian, pituitary (craniopharyngioma) or adrenal tumors\n• polycystic ovarian disease\n• testicular feminization It is rare for primary amenorrhea to be caused by tumors but it can be a cause and should always be a consideration if other factors are ruled out.
381529
If the twins are still attached and the survivor can't be surgically separated, both die...usually if they can't be separated, it is because they share organs.
1138453
They will separate the body from the living twin and attempt to construct the features as close to normal as possible.  The other twin would die, on the other hand, if some major artery or organ was shared that shuts down after the other twin's death.
687705
Well certain illnesses and medications can cause this. Also being sick with a cold, sinus problem etc... can. \n\nBut with my husband he was pretty much born with no sense of taste or smell. It is not good. His identical twin brother has the same problem but not as extreme as my husband. He can eat, taste, and smell more. \n\nTheir mom did not know she was having twins, really, till she had them. She had another child before this. And they were a bit early too. But still a bit over 5 lbs. \n\nENT doctor and others told my husband there is nothing they can do. He has to put a lot of salt on his food and he only eats certain things. He is a meat and potatoes guy. He does not like a lot. But like he told me. He does not eat a lot, it would be like eating cardboard, how some things must seem to him!!! His weight is normal though.
878652
There are 2 reasons for this anomaly to develop. The first one is the result of muscle buildup from the head being held too far forward.  The second one is the result of degeneration (deterioration) of the discs and/or vertebral bodies, in the upper back. The age factor, would determine the expectation of either.
112493
Predisposing factors\nThe cause of monozygotic twinning is unknown. Fewer than 20 families have been described with an inherited tendency towards monozygotic twinning (people in these families have nearly a 50% chance of delivering monozygotic twins). Some evidence suggests that the environment of the womb causes the zygote to split in most cases.\n\nDizygotic twin pregnancies are slightly more likely when the following factors are present in the woman:\n\nShe is of African descent \nBetween the age of 30 and 40 years \nGreater than average height and weight \nConception is soon after the cessation of oral contraceptives \nSeveral previous pregnancies. \nWomen undergoing certain fertility treatments may have a greater chance of multiple births. This can vary depending on what types of fertility treatments are used. With in vitro fertilisation (IVF), this is primarily due to the insertion of multiple embryos into the uterus. Some other treatments such as the drug Clomid can stimulate a woman to release multiple eggs, allowing the possibility of multiples. Many fertility treatments have no effect on the likelihood of multiple births.
140509
My sister had operation because of scoliosis and she had no problems during her pregnancy, she had a baby during natural way (no Cesarian section) aand she is pregnant again :)
133127
I think this type of situation is extremely rare.  It is unlikely that a situation in which one twin was dependent upon the other would not be medically dangerous for the stronger twin.  It is not uncommon for conjoined twins to share organs, and it is often the case that separation would allow the survival of one and not the other, but in the situation you described it is unlikely that the twins would survive to adulthood.\n\nThat said, I don't think its realistic to attempt to give conjoined twins the right to privacy from each other.  Given that the decision of separation would effect both their bodies, I don't think it could be made unilaterally by one of the twins.  I think the surgery would require mutual concent.  And if the weaker twin consented, it becomes an issue of assisting suicide.
832746
Genetics is the primary factor.During birth sometimes the head becomes misshapen. Usually this rounds out.In older age tthe ears and nose keep growing and erhaps the jaw bcomes more prominent.Chewing should not be a factor.  Of course there is plastic surgery for vanity or because of an accident,
1052428
Asthma has a genetic factor, among some others.\nyou and your twin (assuming that your are identical twins) share the same genetic information. In case that you are not identical you still share 50% of your genetic information with each of your brothers of sisters and maybe some of this shared information is the susceptibility to develop asthma\nYou share some but not all the genetic information with your other brother and sister and maybe some of the genes that made you susceptible for developing asthma were not in them.\nif maybe you had in the future more brothers or sisters some of them could share the susceptibility to asthma too. \nand maybe your brthers and sisters have other susceptibilities that you don't have\n\nstick to your treatment and you'll do fine