TWINS

TWINS

The correct term for identical twins is MONOZYGOT. Monozygotic twins form from a single (mono) fertilized egg. The zygote splits into two parts after conception, resulting in the development of two individual embryos. Because the two embryos are the result of a single egg,sperm combination, they have the same genetic,They have the same DNA.

DIZIGOTIC twins often referred to as fraternal, are the result of two eggs fertilized by two separate sperm. Although most women only have a single egg in an ovulation cycle, sometimes multiples eggs are released. Dizygotic twins share about 50% of their genetic traits, the same as any other siblings born at different times.

SOME INTERESTING THINGS ABAUT IDENTICAL TWINS:

• The causes  of monozygotic twinning are unknown and unidentified. No one really knows why an egg splits; technicaly it's a malfunction of the normal development procces.
• There's no hereditary trait that influences a predisposition to having identical twins. Identical twins is not genetical. Although there are families with a high incidence of identical twins, it is due to chance, coincidence or good luck.
• Despite their shared genetic set, identical twins are unique individual. No two individuals are exactly like.
• Do identical twins always share a placenta during pregnancy?No, this is a myth. Even many doctors will mistake identify twins as fraternal because there are two placentas. It depends on when the egg splits. If it is early enough, the two embryos will implant separately in the uterus and develop individual placentas. If the split occurs later, they may share a placenta.

• Identical twins represent about a third of all twins. Dizygotic twins are twice as common as monozygotic.
• Birth rate statistics for identical twinning have remained stable over the years, despite the overall increase in twins and multiples since the late 1980's. The odds of having identical twins is about 3 in 1,000, whereas the birth rate for all twins is about 32.2 in 1,000.
• Identical twinning is not generally influenced by fertility-enhancing treatments like drugs or in vitro, although monozygotic twins have been produced in pregnancies that were the result of such treatments.
• Birth rates for identical twins are consistent across populations; it is the same regardless of race, geography or maternal age.
• Twins talk with a particular language, baby talk, "idioglossia",  the phenomenon of twin language, a fascinating concept that has intrigued researchers and parents.

I also recommend to read the article in the Times Magazine "Mission Twinpossible": the kelly twins- one in orbit and one on earth- may help NASA unlock the secret of long-term space travel.