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Answered 2013-03-31 01:07:36

i say that identical twins are the least rare because like me a fraternal twin i only know 1 pair of fraternal twin.

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Quads can be identical, fraternal, or a pair of identical twins. Identical quads are rare- that would require 1 egg divide into 2, and then divide again into two. Most quads are fraternal.

Identical twins come from a single fertilized ovum, and are always of the same sex. Fraternal twins come from separate ova, and may be of different sex. Its ferternal.actualy, furturnal twins are normal. identical twins are rare. identical twins are twins that look axactly alike, and furturnal twins do not look the same.

Not usually no. Fraternal twins are conceived from separate eggs within the mothers womb. While identical twins start as one embryo and then split and grow into 2 babies. If a woman was sexually active with more than one man it is possible for fraternal twins to have different fathers, but it is extraordinarily rare.

yes they can be but it's really rare. Most of time a brother and sister twin will be fraternal but identical ones can happen

Fraternal twins (dizygotic twins) are simply two fertilized eggs that are implanted in the uterus at the same time. Identical twins (monozygotic twins) is one fertilized egg that separates into two embryos. In most cases, identical twins share one placenta, but have separate amniotic sacs. In some cases, they have two placentas. In rare cases, they share both the placenta and the amniotic sac.

Identical twins will have the same father, so a paternity test is done just like for any kid. With fraternal twins, it is possible, but very, very rare, to have different fathers for the babies.

They'd be fraternal twins then, and it is indeed possible - but very rare.

yes, but it is extremely rare.

Genetic testing is the only way to positively identify what type of twins you are having. Identical or monozygotic (MZ) twins occur when a single egg is fertilized to form one zygote (hence, "monozygotic") which then divides into two separate embryos. Half-identical or semi-identical twins (also referred to as "half twins") are the result of a very rare form of twinning in which the twins inherit exactly the same genes from their mother but different genes from their father. Fraternal or dizygotic (DZ) twins (also referred to as "non-identical twins" and in cases of females, occasionally sororal twins) usually occur when two fertilized eggs are implanted in the uterus wall at the same time. When two eggs are independently fertilized by two different sperm cells, fraternal twins result.

Monozygotic (Identical) twins are always of the same gender, except in extremely rare cases of chromosomal defect.

It depends on the type of twins. For identical twins, it only takes one egg and one sperm, which split into two embryos.Fraternal twins (or triplets+) are caused when two separate eggs are fertilized by two different sperm to produce two embryos.It takes two sperm to make fraternal twins (boy and girl) to get into the egg but to make identical, it takes one sperm and the egg splits in two resulting in identical twins. This is why they are identical, because they are exactly from the same egg and have the same gender. If one sperm only gets in, there is chance of the egg splitting in two for identical twins but most likely a single baby . The reason only one sperm can get in is because after one has penetrated through the egg, the egg sends a wave that sends the sperm away. This is why having twins is more rare than having one baby.Mono zygotic twins, frequently referred to as identical twins, occur when a single egg is fertilized by a single sperm, which then divides into two separate embryos.

Short answer: The treatments increase the number of viable eggs present in the female. The more eggs present, the more children possible. Longer answer: It should first be noted there are two types of multiple birth (or "twins"); "Identical" and "fraternal". In a normal birth one egg is fertilized by one sperm and produces one child. If more than one egg happens to get fertilized, then more than one child is produced (commonly referred to as a fraternal twin). In rare cases one egg may split after it has been fertilized; this becomes two (or more) identical twins. Identical twins have nearly matching DNA and from a genetic stand point are almost the same person on a biological level. (some tests cannot distinguish between them at all, the difference in DNA sequence often being less than a fraction of a percent) With fraternal twins they do not share identical DNA. Fraternal twins are when more than one egg is fertilized and grow at the same time. From a genetic stand point these are clearly two different people. They share the same amount of DNA as normal siblings, but not the nearly matching DNA of an identical twin. On a biological level they honestly are not twins, they just happen to be born on the same day. In regards to fertility treatments; the presence of more eggs from the treatment increases the odds of fraternal twins. This is pretty straight forward logic; if the presence of a normal amount of eggs typically produces 1 or more children than the presence of an even larger amount of eggs will increase the odds of even more children at once. However the odds of identical twins is not increased. Basically the rarity of any one of those eggs splitting to become identical twins remains just as rare. So while multiple births are more common, that is simply more eggs being fertilized at the same time because more are present; but none of them individually have any increased chances of splitting.

Well the chances are unknown to me but theres a one in a million chance that you might have identical twins. Identical twins are rare in some cases. Hopefully you have an identical twin if you want one.

Yes they can but it's extremely rare. Most dogs usually give birth to single puppies in one litter but sometimes though, they can have two puppies born in the same sac which you would call twins but the identical kind not fraturnal. Just like humans, dogs can have sets of identical twins or fraternal twins. But the chances are, when your dogs is pregnant she may only have single puppies and no twins. But in one out of a million dog pregancies people have reported that their dogs gave birth to twins. It's rare but it's quite possible.

Yes, they can! But it is extremely rare and I am not sure how it happens. : )

Although it is biologically impossible for a single egg to be fertilized twice, it is possible for two different eggs to be released at the same and fertilized by different men resulting in fraternal twins each with a different father. Identical twins cannot have different fathers, but fraternal twins can. Keep in mind both men's sperm must be present to fertilize the eggs. The term for the occurrence of fraternal twins being born with separate fathers (or triplets, ect. but ONLY fraternal) is called Hetero-paternal Superfecundation and is also referred to as bi-paternal twinning. Once thought to be very rare it is now estimated that one in twelve fraternal twins are actually are bi-paternal. (Wow!) It's actually common in some other species for a litter to have mixed paternity.

Yes. Conjoined twins form when the fertilized egg starts to split, but does not completely split into two. Improved. There are no known cases of opposite sex Conjoined twins but that does not mean it can not happen. it is generally believed that identical twins means actually identical but the correct term now is actually monzygotic twins meaning one sack the reason they use this term is because to simply put it identical twins is actually rare when twins are born of the same sack Mono they are rarely actually identical and as such it is possible for a monozygotic twins to not completely sperate but in rare cases actual identical twins can in fact be of seperate sexual phenotype's they usually have some other defect

No, your husbands genetic ability for twins does not pass to you. It would pass onto any child you will have together. If you have the multiple birth trait in your family, you and your husband would have a high chance, but since it is only your husband any -daughters- you have may produce multiple births. The males will only pass the trait to the next generation, The mother is the one who's chances of twins is what matters in the pregnancy. The mother either has a genetic trait to release more than one egg (fraternal twins or more depending on the number of fertile eggs) or the single egg (for scientifical unknown reasons) will split causing identical twins, in extremely rare cases (1 out of 500,000 births) identical triplets. Hope this helps.:)

When a set of fraternal twins have offspring, it is possible for one or more of these children to contain both sets of the fraternal twins separate DNA. Testing may show one set or the other, which would create a false reading, though true. This is the result of a genetic mutation during incubation, while the twins are invitro, but because they have different DNA their genomes can merge or mix, resulting in a genetic "chimera." This is rare, but possible.

Yep. It can only happen in girls, though - and it's very rare. See: and

Yes,In the case of fraternal twins, a woman has ovulated more than once in a given month, thus releasing more than one egg. If this occurs and each egg is fertilized by sperm cells from the same man, fraternal twins are formed that have the same father.While extremely rare, it is possible that each egg is fertilized by sperm cells from two different men, thus forming twins with two different fathers, called bi-paternal twins. According to recent studies published by the National Institutes of Health, it is estimated that approximately 1 in 12 fraternal twin sets are bi-paternal, meaning that each twin has a different father

Twins are rare and special, occurring in about 2% of all pregnancies. Of that number, 30% are identical twins. The other 70% are non-identical, or fraternal twins.This animation will show you the differences between the development of a single baby, identical twins, and fraternal twins.Starting with the single baby, let's go back to the beginning, when fertilization occurs. Here you see that the egg cell is fertilized by a single sperm cell to form a zygote. Over the next few days, the fertilized egg cell divides over and over to form a structure composed of hundreds of cells called a blastocyst.During the first week after fertilization, we can look inside the blastocyst and see the mass of cells that will form the embryo. Right there. The blastocyst will continue traveling toward the uterus where it will implant in the uterine lining, and grow into a single baby.Now let's watch the development of identical twins. Identical twins start out from a single fertilized egg cell, or zygote, which is why they're also called monozygotic twins. Like the single baby we just saw, the egg is fertilized by a single sperm cell.Unlike the single baby, this fertilized egg cell will split into two separate embryos, and grow into identical twins. This remarkable event takes place during the first week after fertilization, and can happen at several different times:At the two cell stage on days 1 to 3At the early blastocyst stage on days 4 to 6Or in the late blastocyst stage on days 7 to 9The stage at which the egg cell splits determines how the twins will implant in the uterine lining, and whether or not they share an amnion, chorion, and placenta. Basically, the earlier the splitting occurs, the more independently the twins will develop in the uterus. So, a pair of identical twins that split during the two-cell stage will each develop its own amnion, chorion, and placenta.Twins that split during the late blastocyst stage will share an amnion, chorion, and placenta.A common misconception about the conception of 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.Now let's take a look at the second type of twins. Non-identical, or fraternal, twins develop from two fertilized egg cells, or zygotes. Which is why they're also called dizygotic twins. Unlike identical twins, however, fraternal twins are definitely influenced by the mother's genes. Here's why:When the mother of fraternal twins ovulates, sometimes her ovaries release two egg cells for fertilization. Typically, only one egg cell is released during ovulation.During conception, both of these egg cells become fertilized by two different sperm cells, which is why fraternal twins don't look exactly alike. Sometimes they're not even the same sex.Here in the uterus, you can see that the twin embryos develop separately each having his or her own chorion, amnion, and placenta.Reviewed ByReview Date: 09/16/2008Dan Sacks MD, FACOG, Obstetrics & Gynecology in Private Practice, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.

To answer this question, it is helpful to know if these are identical or fraternal. If identical, these babies came from a single egg. They will have exactly the same genes. If they are fraternal, they will be like brothers, except born at the same time. Their genes will not be exactly the same. Now if they are identical, the chance ranges from 1 in 200,000 to 1 in 200 million. It seems that the range is so wide because this is so rare. Of the four million births in the US each year only about 7,000 are triplets. Add to this, the question as to whether they are identical or not.

Naturally conceived twins occur in approx. 1 in 89 births Identical twins are much more rare than fraternal. They occur in approximately 1 in 250 births. There are things that can increase your chances of having a multiple birth, including a mother being 30 or over when she conceives. For example, while there is a 3% chance of having a multiple birth at age 25-29, it increases to 4% at 30-34 years and almost 5% at 35-39 years. Other factors that can increase your chances of having twins include having a maternal family history of multiple births (fraternal), and of course, using fertility treatments (in vitro fertilization or fertility drugs). Your chance of having twins is also influenced by your race (multiples are more common in African Americans and least common in Hispanics and Asians), how many times you have been pregnant (the chance of having twins increases with each pregnancy), and whether or not you have had twins already.

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