The formation process of Infant Twins

Twins there are two types:

1. Identical Twins
2. Non-identical twins

1. Identical Twins

 Identical twins are also called monozygotic twins hail from one egg (ovum) and a single sperm cell fertilization and which have become a zygote. In its development, the zygote divides into an embryo that is different. The 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 are not monoamniotik can share the same placenta (known as monochorionic, monochorionic) or not. All monoamniotik certainly monochorionic twins. 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 disrupt the blood supply to the developing fetus.

The characteristics of identical twins

•  Same sex
•  Same blood group
•  Like face

 2. Non-identical twins

     Non-identical twins or dizygotic twins come from two sperm cells and egg cells distinguished two each experiencing conception into 2 zygotes. In humans, the process of ovulation is sometimes release more than one mature egg into the fallopian tubes, which, if they are fertilized, will bring more than one zygote. Dizygotic twins are genetically no different than ordinary brothers and thrive in a separate amnion and placenta.

The characteristics of non-identical twins :

•  Can be different sexes
•  Blood type can be different 
• The face is not so similar.

Plasentasi types of twins:

  1. plasentasi diamniotik dikarionik 

    Occur in non-identical twins

 2. plasentasi diamniotik monokarionik

                                                                  Occur in identical twins

3. plasentasi monoamniotik monokarionik

  Occur in identical twins

Cause Birth of Twins
Many factors suspected as the cause of multiple pregnancies. In addition to genetic factors, fertility drugs are consumed with the aim that perfectly mature egg cells, also suspected it would trigger the occurrence of twins. The reason, if the ovaries can produce eggs and was given fertility drugs, then the mature egg cell at the same time can be considerable, even up to five and six. Until now scientists have not agreed on the existence of genetic influences for the occurrence of identical twins.

Apparently the secret is on fertility drugs gan
There are also vitamins which can increase the fertility gan, namely vitamin E. Agan-agan able to vitamin E dr olive oil, sunflower oil, nuts and green vegetables, bean sprouts / jg sprouts are loaded with vitamin E. Just a note: vitamin E is cm increase fertility, if you seriously want to have twins should consult a doctor only 

Source

http://www.kaskus.us/showthread.php?t=7063926