Literally, having two chorions and two placentas -- used especially of human fraternal twins. That is to say, not identical twins growing in a single sac, but two completely separate fetuses with separate placentas.
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Yes, the number of placentas (chorionicity) and amnions (amnionicity) depend on the stage at which the fertilized egg splits. The earlier the split, the more likely each fetus will have its own placenta and amnion. If the egg splits before or by day 3 - each fetus will have its own placenta and amnion resulting in a dichorionic diamniotic pregnancy.
Yes, it is common for twins to have two separate sacs in a pregnancy, known as dichorionic diamniotic twins.
No, twins can either share the same placenta (monochorionic) or have separate placentas (dichorionic), depending on whether they are identical or fraternal twins.
Concordance rates that suggested a role of genes in schizophrenia might more accurately be interpreted as a reflection of the influence of shared prenatal experience.
Yes, identical twins can have separate sacs and placentas, which is known as dichorionic-diamniotic twins. This occurs when the fertilized egg splits into two embryos early in development, resulting in each twin having its own sac and placenta.
If a fertilized egg splits into two, it results in identical twins. These twins will share the same DNA and typically have similar physical characteristics. They can either develop separate placentas (dichorionic) or share a single placenta (monochorionic), depending on when the split occurs during development.
The thin transparent membrane that separates a pair of twins in utero is typically indicative of diamniotic, monochorionic twinning. This means that the twins each have their own amniotic sac but share a single chorion. Twins that have separate chorions and amniotic sacs are known as dichorionic, diamniotic twins.
Yes, twins who share the same placenta (monochorionic twins) have a higher risk of complications during pregnancy compared to twins with separate placentas (dichorionic twins). This is because monochorionic twins are more likely to experience conditions such as twin-to-twin transfusion syndrome and selective intrauterine growth restriction.
Yes, a woman can have two amniotic sacs, which typically occurs in the case of a multiple pregnancy, such as twins. Each fetus can develop in its own amniotic sac, a condition known as dichorionic-diamniotic twins. This situation allows each fetus to have its own space and fluid, reducing the risk of complications associated with shared sacs. However, not all twins will have separate sacs; some may share one, leading to different classifications of twin pregnancies.
Twins with two sacs and one placenta, known as monochorionic diamniotic twins, share a placenta but have separate sacs. This type of twin development carries a higher risk of complications compared to twins with separate placentas, known as dichorionic diamniotic twins. The shared placenta in monochorionic twins can lead to potential issues such as unequal sharing of nutrients and blood flow, which may require closer monitoring and medical intervention during pregnancy.
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Mean is the average.