can twins be identical if they have their own placenta?
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Monochorionic-monoamniotic twins are identical twins who share both a placenta and an amniotic sac. ... Dichorionic twins each have their own placenta and amniotic sac. This occurs in approximately 30 percent of pregnancies of identical twins. All fraternal (non-identical) twins also are dichorionic twins.
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No, since identical twins only split up after the genetic traits are decided. Physically, they are identical in every way. The only way they could have a different hair colour would be for them to dye their hair. Physically, they are identical in every way.
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One, No More Than Two Embryos Identical twins following IVF tend to share a placenta and one of the pregnancy membranes, which makes the twin pregnancy riskier in terms of harsh growth conditions and death in the womb for one of the twins.
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Having identical twins is not genetic. On the other hand, fraternal twins can run in families. ... For example, a woman that has a sibling that is a fraternal twin is 2.5 times more likely to have twins than average! However, for a given pregnancy, only the mother's genetics matter.
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With multiples, the number of placentas can vary. There can be multiple placentas, one per baby, or a single placenta that is shared by the babies. The number of placentas can be an indicator of the zygosity of the twins, a term that refers to whether they developed from the same egg or from different eggs.
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The twins have the same DNA; thus, the same phenotypes. Unless one twin had an accident that caused damage to the reproductive organs, identical twins' reproductive organs are completely identical in size and shape because they have identical DNA. If the twins are fraternal, no more likely than any other siblings.
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We think of identical twins as having identical DNA. After all, while huge differences can and do happen with fraternal twins, identical twins are usually exactly that -- identical in skin, hair and eye color. ...
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Yes! Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... So identical twins with identical DNA may have different genes turned on, causing them to look and act differently, and even to develop different diseases such as cancer.
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Two Placentas for Fraternal Twins Dizygotic or fraternal twins will always have two placentas. Also called "sibling" twins or "false" twins, the babies are just as unique as any other siblings.
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Mirror image: Identical twins are believed to be genetically identical, but one twin can have mutations not shared by the other. Identical twins can be genetically different, which could explain why they do not always share disorders such as schizophrenia or autism, according to a study published in March in PLoS One.
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Identical (monozygotic) twins occur when a single egg is fertilized by a single sperm and divides into two embryos. This split can occur at any stage up to nine days after fertilization and its timing is critical to the way the placenta(s) and amniotic sac(s) are formed.
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Identical twins that share a single placenta are called monochorionic twins (MC). ... While fraternal twins (2 eggs and 2 sperm) are always surrounded in their own sacs and have their own individual placentas, 70% of identical twins may end up sharing a single placenta.
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One-third of identical twins have separate placentas. This happens when the fertilised egg splits before implanting in the uterus, up to 4 days after conception.
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You can tell identical twins apart by their belly buttons! Even if everything else seems extremely samey-same with your matching pair, twins' belly buttons will be different because they heal differently, post-birth.
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After all, while huge differences can and do happen with fraternal twins, identical twins are usually exactly that -- identical in skin, hair and eye color. ... Even though this is true for all identical twins, we can't usually tell because the changes happen in parts of the DNA that don't affect how identical twins look.
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Monozygotic or identical twins (also called "real" twins) can have individual or shared placentas, so the number of placentas can vary. Monozygotic multiples form from a single egg and sperm combination that splits after conception.
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7.1 Two identical twins have exactly the same set of genes. They are separated at birth and grow up in different households. If a scientist were to study the twins as adults, would he find them to be identical in every way, since they have the same genes?