Twins Baby, Child, and Pictures (Types)

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Twins Baby, Child, and Pictures
Twins or twins are two or more individuals who share the same uterus and are usually, but not always, was born in the same day. In humans, women with content that brings twins into labor will thus multiple and usually contain a shorter period (34 to 36 weeks) rather than a single baby pregnancy. Because preterm birth usually have health consequences for babies, twin births are often handled specially in a slightly different than normal birth.

Twin deliveries are common in animals because many animals that produce eggs cooked (ready to be fertilized) at the same time. Domestic animals such as cats, dogs, rats, or sheep usually have more than one child at birth.
Types of Twins

Judging from the origin of the zygote, there are two types of labor twins: fraternal (dizygotic) and identical (monozygotic). Dizygotic twins are common in vertebrates, while monozygotic twins is a rare thing. Humans have this ability. Armadillo ribbed-nine (Dacypus novemcinctus) if the delivery has always had four monozygotic twins
Dizygotic or fraternal twins (DZ)

Dizygotic twins (known as "non-identical twins") occur because the zygote-zygote is formed from a different egg. There are more than one egg is attached to the womb wall by sperm cells at the same time. In humans, the process of ovulation is sometimes release more than one mature egg into the fallopian tubes are fertilized when they will bring more than one zygote.

Dizygotic twins are genetically no different than ordinary brothers and thrive in a separate amnion and placenta. They can have different sexes or the same.

Studies also show that talent gave birth to the offspring inherited the DZ twins (is genetic), but only female offspring / female who is able to show it (because only female / female who can manage the expenditure of the egg).

The term given to the Dampit twins twins with different sexes.
Monozygotic or identical twins (MZ)

Monozygotic twins occur when a single fertilized egg cell to form one zygote (monozygotic). During its development, the zygote divides into a different embryo. These two embryos develop into fetuses sharing the same womb. Depending on the phase separation of zygotes, identical twins may share the same amnion (known as monoamniotik) or different amnion. Furthermore, identical twins can not monoamniotik share the same placenta (known as monochorionic, monochorionic) or not. All monoamniotik definitely monochorionic twin. Sharing the same amnion (or the same amnion and placenta) can cause complications in pregnancy. For example, the umbilical cord of twin monoamniotik can be twisted to reduce or interfere with the distribution of blood to the developing fetus.
 
MZ twin pairs are always the same and is genetically the same (clones) unless there is a mutation in the development of one individual. Twin similarity level is very high, with differences sometimes occur in the form of similarity of reflection. Differences occur in terms of detail, like a fingerprint. When individuals grow older, level of similarity is usually reduced because of personal experience or a different lifestyle. Research from Fraga et al. (2005) reveal the influence of epigenetic processes that distinguish individuals MZ twins, due to different genes are switched on.  Despite the influence of habit or experiences that influence these differences, scientists assumed random processes contribute more towards differences that occur. Research with mice even show a difference in the activity of histone (associated with epigenetic) of the first four cells are formed.

Until now scientists have not agreed on the existence of genetic influences for the occurrence of MZ twins. But note there are several places in the world that has a frequency of MZ twins is higher than other places.

Differences ordinary and Siamese twins

In the usual sequence of twin babies born children are distinguished because one by one while the mother remained conjoined.

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