Multiple
births are a rare occurrence in humans, and can either be identical or fraternal
twins. Identical twins are formed when a fertilized egg splits into two
separate zygotes, each developing into a new individual with identical genetic
makeup. This type of twinning is known as monozygotic twinning and is a random
event that occurs naturally during the early stages of embryonic development.
Identical twins are always of the same sex, and may share the same placenta,
chorion sac and umbilical cord while having their own amniotic sacs. In some
cases, a fertilized egg may divide more than once, resulting in the formation
of four identical embryos, and thus four identical twins.
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| Identical Twins |
On
the other hand, fraternal twins occur when more than one egg is released from
the ovary or ovaries and is fertilized by separate sperm. These twins are also
known as dizygotic twins and are more common than identical twins. Each
fraternal twin develops separately, with its own placenta, cord, chorion sac
and amniotic sac. Unlike identical twins, fraternal twins do not share
identical genetic makeup and can be of different sexes, just like any other
siblings.
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| Fraternal Twins |
It's
important to note that the likelihood of having twins or multiple births can be
influenced by various factors such as age, family history, and certain
fertility treatments. While multiple births can be an exciting experience for
families, it's important to be aware of the potential risks and complications
associated with carrying and delivering multiple babies.
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