Doctor insights on:
How Can Identical Twins Be Very Different Sizes
Some do some don't: If two twins share the same sac, they're identical. (almost always works.) the pathologist who examines the placenta can tell. Identical twins can have two sacs, or one sac; if there are two sacs, there can be one or two chorions. Fraternal twins won't share chorions or sacs. ...Read more
Identical twins have the same DNA sequence, then how would you explain the different patches of sweat glands, can you explain?
The twins share the same DNA sequence but going from a fertilized egg to splitting into multiple cells to form a human can be influenced by several factors that can lead to individual differences. I found this article very helpful in answering your question.
http://multiples.about.com/od/funfacts/a/differenttwins.htm ...Read more
Yes: Fraternal twins are 3 times as frequent as identical. Fraternal twins happen when there is double ovulation and 2 eggs get fertilized. They are the type of twins that run in families. Identical twins come from 1 fertilized egg which separate in early gestation. Depending on when they separate, the babies can be in 2 distinct sac (di/di), 2 sacs within a shared sac (mono/di) or 1 sac (mono/mono). ...Read more
Not always: They would be no more likely to look alike than any other siblings. ...Read more
If you are asking: If two identical twins, say both are women giving birth at the same time, have a higher chance of having the same gender for their babies, then the answer is no. The probability is 50% for 1 twin mother and 50% for the other twin mother delivering both a boy, 0.5 x 0.5 = 0.25 or 25%, but adding to the same probability for a girl. So 25% both girls + 25% both boys = 50%. ...Read more
Yes: Actually this is slightly more common after day five transfer ~1%. Since the embryo is in nearly hatching or hatching, the transfer "pressure" can cause the embryo to split into identical twins. This is one of the disadvantages of day 5 transfer. Good luck. ...Read more
Can an orgasm kill an unborn identical twin?
Should orgasming be stopped due to identical twins or MoMo twins?
No, if all is normal: A fetus can die after the pregnant woman has an orgasm, but can also die before she has an orgasm. A fetus can die after the woman eats a peanut butter and jelly sandwich. All these things do happen, BUT are they related? The answer is NO, unless the woman has a problem that causes two things to be related (such as having a peanut allergy, and a life-threatening reaction after a PB&J sandwich). ...Read more
Both : A fertilized egg cell will split into two separate embryos, and grow into identical twins. A common misconception about identical twins is that the trait for having them is passed on to future generations through the mother's genes. But the truth is science doesn't know the reason why identical twins occur. At this time, we can just say that they're examples of a nine-month double miracle. ...Read more
If you have identical twins, will they both develop the same genetic/inherited disease at the same point?
Depends: If it's something that fully expresses itself with no modification (such as huntington's), yes. If it's going to express itself but is lifestyle-modifiable (type ii diabetes), timing will differ. The diseases for which there's a genetic component (diabetes, lupus, multiple sclerosis, many others) have only one twin affected more often than not -- you can find details. ...Read more
After healthy heart rates are identified in identical twins, what is the probability of a vanishing twin?
Fairly common: A conservative estimate of frequency is that vanishing twin syndrome occurs in 21-30% of multifetal pregnancies. More commonly identified now that first trimester ultrasound is widely used. There are no known preventive measures since the loss usually occurs because of cord implantation abnormalities. Thanks for trusting HealthTap! ...Read more
My Husband has multiple sets of fraternal twins on his side and I have identical twins on my side, is the twin gene carried on the male side or woman?
Female Side: Genetic increase for twins is due to female tending to ovulate more than one egg at a time, so trait is for fraternal twins (not identical) and carried by mother. ...Read more
Why would my pediatrician be concerned about my 15 month (13 adjusted) identical twins girl's height?
We always watch it: Pediatricians always watch the height, weight, and head size for a baby or toddler. That's how we know if the growth is fine. Sometimes, two or three measurements are needed to get an accurate number on a squirming baby. We get concerned if a number is "off the graph" on the growth chart, or if numbers are trending too high or low for a particular child compared with her peers, sibs, or parents. ...Read more
Do identical twins have the same sexual orientation? If not, does that mean sexual orientation is not encoded in DNA?
Twin DNA: Although identical twins have the same DNA, the DNA molecule has the potential for mutation, and changing the gene's expression creating differences depending upon the gene(s) involved. Gender identity is thought to be determined by genetics as well as other factors, although an actual variation or determining factors have not been identified. ...Read more
I Hope Not!: Twins at 7 weeks should be fairly clearly visible on a transvaginal sono. As far as whether they might be identical, that is a more difficult question to answer by sono and requires careful analysis of the membranes surrounding fetuses, unless there is a single sac which would only be seen in an identical twin (rare). They can also be in 2 sacs however. ...Read more
How often can a donor egg embryo split and result in identical twins? Is it in most cases or is it rare? We will be using icsi
1-2%: The reported risk is about 1-2%. No longer believed in general to be related to icsi. When more than 1 embryo is placed inside the risk seems to be higher for reasons which are not known. Also, the risk as far as I am aware is not higher in donor versus non donor egg. ...Read more
I am a 42-year old woman mother of identical twins naturally conceived my last period was on july the 24th I had unprotected sex on august 4th did not get my period aroun the days I was supposed to slightly irregular could be off by 2 5 days mostly 2days
Yes: Albeit a weak answer.... Eye color can change during your lifetime due to a whole host i reasons. So although at birth identical twins would theoretically have the same color eyes, that may change over time. ...Read more
My aunt died from stage 4 pancreatic cancer in 03/2013. She has an identical twin sister-is she at higher risk? She had the different one than swayze
Perhaps: Only a few pancreatic cancers are thought to be hereditary. The majority occur without a family history. There are several types of pancreatic cancer and I do not know what type mr. Swayze had. ...Read more
My identical twin 10 year old daughters were born same size. One keeps getting bigger, now 3 in taller and 20 pounds of muscle. Could this be due to her being on steroids at age 1 (for a hemangioma)?
Thyroid cancer and heredity? How much does heredity play a part in getting thyroid cancer? Is it different if the relative who had it is a cousin vs. A mother or an aunt? What about an identical twin?
A little bit: Authorities think about 5% of patients with thyroid cancer may have a hereditary component. We can't identify the genes yet, and go by "clusters. In general, the closer the relative, the more likely you will have thyroid cancer, assuming that this has a hereditary component. But most don't. ...Read more
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