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Twins Essay

  • Submitted by: grace95
  • on August 29, 2013
  • Category: Miscellaneous
  • Length: 1,372 words

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Below is an essay on "Twins" from Anti Essays, your source for research papers, essays, and term paper examples.

Have you ever wondered why twins happen?   How often they occur?   Or what are your chances of having twins?   Twins are two babies that are produced in a single pregnancy and then are born during the same birthing process.   Twins occur about one in every forty-one births, so they’re more common than you might think.
      There are two forms of twins: identical and fraternal.   The most common form of twins is fraternal.   Fraternal twins occur about eleven to twelve times per one thousand births. They are formed when two eggs are released during a woman’s menstrual cycle and are each fertilized by a separate sperm.   Fraternal twins will always have separate chorions (inner membranes) and separate amnions (outer membranes). Fraternal twins most often have their own placenta, but sometimes if the eggs are imbedded in the uterus wall close together, the two placentas will fuse together.   Since fraternal twins are fertilized each by their own sperm, they can be boy and boy, girl and girl, or boy and girl.   Other names for fraternal twins are non-identical, dizygotic (from di = two; zygote = fertilized egg), or binovular (from bi = two; ovum = egg).
      The second type of twins is identical.   Identical twins are less common than fraternal twins, and occur only about three for every one thousand births. Identical twins are formed when a single egg is fertilized by a single sperm and then the fertilized egg splits one extra time, and two fetuses develop.   Most identical twins share the same placenta and chorion, but not all do.   Some will have separate placentas, or two placentas that have fused together, and some will have separate chorions. Almost all identical twins will have separate amnions. But in rare cases, there have been identical twins that share a yolk sac, a chrionic sac, and an amniotic sac.   These twins are called Monoamniotic Monochrionic twins.   Identical twins will always be the same gender because they develop from a single egg and single sperm....

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