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Strange as it sounds, there are ten possible types of twins. Three of them are dizygotic (fraternal) and seven of them are monozygotic (identical).

Dizygotic twin types:

  • Fraternal twins, born of two eggs fertilized at the same time. This is by far the most common type of multiple birth.
  • Fraternal half-twins (heteropaternal superfecundation), born of two eggs fertilized at the same time by two different fathers.
  • Superfetation, a rare condition in which another egg is released, and then fertilized, while the mother is already pregnant. This results in two fetuses at different stages in their development, sometimes by a month or more.

Monozygotic twin types:

  • Identical twins, born from a single zygote (fertilized egg) that then splits, usually within the first week of conception.
  • Mirror twins, identical except for having opposite features (including handedness, hair growth, etc.), usually formed from a single zygote that splits sometime after the first week of conception.
  • Conjoined twins, born physically linked to each other, believed to result from a single zygote that splits, then partially reattaches during the course of the pregnancy. The earlier they rejoin, the greater the level of interpenetration. These are often referred to as Siamese twins, after a famous example who lived in 19th-century Thailand (then called Siam).
  • Parasitic twins (fetus in fetu), a very strange form of conjoined twin in which one of the zygotes fails to develop properly, and instead becomes a living parasite inside the body of the surviving twin.
  • Polar body twins, a very rare and not well-understood condition caused by two different sperm somehow fathering the egg after it has already split once; the smaller part of such a split is called the polar body, and is usually discarded as leftover or waste material. Since the resulting twins share the same DNA on the mother's side, they're somewhere between identical and fraternal; which is why until recently they were called semi-identical twins (see below).
  • Aneuploidal twins, resulting from a genetic abnormality in the sex-determining (X and Y) chromosomes; it requires that at least one of the parents have an abnormal number of chromosomes, a condition known as aneuploidy.
  • Semi-identical twins, a unique variation on polar-body twinning in which two of the father's sperm penetrate the same egg (rather than one to the egg, and one to the egg's polar body). This is the rarest known form of twinning, with only one documented case so far.

The last three (polar body, aneuploidal, and semi-identical twins) are the only forms of monozygotic twinning in which it's possible for the siblings to be of opposing gender. And in all three cases, the unusual conditions which cause them virtually guarantee that at least one, if not both, siblings will have developed some form of aneuploidy themselves.

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Q: How many sorts of mirror twins are there?
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Related questions

Can fraternal twins also be mirror twins?

Mirror Twins are always monozygote twins. This does not mean that fraternal twins won't be a righty and a lefty - if your family tends to run left handed.


Can you have triplets but 2 of them be mirror twins?

no


What are mirror twins?

Mirror image twins are identical and have mirror image differences but are genetically identical which means they have the same DNA. A set of mirror-image twins will have similarities like a mole. One twin would have it on his left arm while the other would have it on his right. Another common feature is one twin being left handed, while the other is right handed. For male twins, the swirl of hair crown is often in the opposite direction.


What is a mirror image?

If you are mirror image twins it means that you are also identical twins. Mirror image twins are created when the fertilised egg splits quite late (around days 9-12), any later and twins can be co-joined.Mirror image twins have small mirror image differences but are actually genetically identical; this means you have the exact same DNA!Some parts of the body are commonly mirrored; mirroring of appendix or heart or other internal organs is rare. We have some examples of our own mirroring:We are opposite handed (Tash is left-handed and I am right)We tend to have mirror image dental problemsPeople often have two different size feet; with us the opposite foot is largerWe look very similar to each other but the resemblance is even stronger if we stand facing each other (as though in a mirror) rather than side by side. Or get both of us facing into a mirror and things start to look very confusing.Our finger prints don't seem to conform to being mirror image - instead they are nearly identical (only one pair of fingers has any major difference)However enviromentally things can make an overall change to the behaviour of mirror image twins however not much will likely change genetically.Thank You Twins Realm for the Supporting Information above.


Do mirror twins have opposite parts of the body?

Hello there...I myself am a mirror twin and I can tell you that mirror twins have been mostly known for having opposite dominating functions like one twin is left arm dominate and the other is right armed dominate twin.My sister and I are even known for loosing the same tooth on an opposite side; however, our organs etc are normal. Some mirror twins vary though.I don't know if mirror twins can be together a male and female.


Are kagamine rin and len twins or a couple?

Actually, Len and Rin are "Mirror Images" of each other. Its because of their last name "Kagamine" from the word "Kagami" which means mirror.


Is it possible for fraternal twins to also be mirror images twins also meanind one is right handed and the other is left handed?

Let's ask Ringo, it's in his category! =D


Can a sonogram produce a mirror image of a baby to where it looks like twins?

of course not! A mirror image would have to have one image of the baby and the second image precisely behind it- and you know that cannot happen in a real uterus! One single image of a baby cannot mirror a second one to the side of it as in fraternal or identical twins. Look in a mirror and move your arms. Does not the arm move preciely in the reflection the same way you are moving it? it may look like two arms to you but its one!!


How many syllables does mirror have?

Mirror has 2 syllables.


Are rin and len lovers?

Rin and Len are not lovers, they are twins/mirror images of one. In a lot of Fanfiction stories, they are lovers though (^^)


Are Kagamine Rin and Len twins?

The Kagamines can be seen three ways: As twins, as mirror images, or as a couple. The creators did not say officially which they were, they left it up to the fans on how they want to view them. They do not have a canon relationship. So, you can see them whichever way you want. This is a big debate in many places. But view them however you choose~!


How many people is two twins?

If there are two twins, the answer is 2 If there are two sets of twins the aswer is 4