IDENTICAL TWINS

Identical twins are also called Monozygotic twins, ie twins come from one egg. Have the same genes, same sex and similar advances.

The process of identical twinning is due at the time of fertilization of a mature egg cell by a

sperm fertilization helps zygote, then this zygote will divide.

If cleavage occurs when the zygote is the beginning of fertilization (1-3 days after fertilization), each embryo will usually have different amniotic sack, and one placenta.

But when the division occurred after 14 days then the twins will probably happen join / stick together on the part of the body or cleavage is not perfect so-called Siamese twins higher. So the twins conjoined twins occur in monozygot. With ultrasound (utrasonografi) physicians will be able to assess the state of the fetus, gender, and position defects.

SHELL PRODUCER PEARL

In principle, the chance of shelled mollusks produce pearls naturally. However, not all oysters can produce pearls are nice and have bought a decent value. Pearl mussel producers generally come from families Pteriidae, but are commonly known only certain types such as gold or silver-lip pearl oyster Pinctada maxima, the black-lip pearl oysters Pinctada margaritifera, Akoya pearl oysters Pinctada fucata and the winged-pearl oyster Pteria penguins.

All members of this family live in the sea. While other mollusks that produce pearls known so far from the group of abalone and a few other gastropods as well as several types of freshwater bivalve shellfish. Each type of pearl oysters produce pearls with different specifications. Pinctada maxima produces relatively larger pearls of all types of shellfish-producing pearls, silver, gold and cream.

This species is much cultivated in Indonesia, Burma, Thailand and Australia. While the shells of Pinctada margaritifera is the belle of the south pacific countries. The resulting pearl color varies from beige to black. The black color is the color of pearls customer demand world today. Thus they were very expensive. The diameter of the pearls produced are generally smaller than that produced by Pinctada maxima.

While Pinctada fucata is the kind that many cultivated in Japan, and Pteria penguin is not much cultivated because so far the results in certain circles, destined only to remember the form of pearls they produce are generally not circular