"Twin-ing"

Twins are rare and special, occurring in about 2% of all pregnancies. Of that num

ber, 70% are non-identical twins (or fraternal twins), and the other 30% are identical.

Non-identical twins or fraternal twins develop from two different fertilized egg cells or zygotes. Which is way they are also called dizygotic twins. When ovulation occurs the mother of fraternal twins usually releases two seperate egg cells for fertilization (one egg cell is ordinarily released during ovulation). Fraternal twins don’t look alike because, during conception both of these eggs become fertilized by two different sperm cells. That is why fraternal twins are not always the same gender. In the uterus the twin embryos, each separately have his or her own chorion (the outermost membrane around the embryo in a mammal), amnion (a protective sac around the embryo), and placenta.

Identical twins are genetically alike, because one egg is fertilized by one sperm. In the very early stages of embryo development, the embryo split and two fetuses grow. A spontaneous divide of the egg into two embroys isn’t considered a hereditary trait, and the reason for t

his divison is still unknown. If during the first 2 days of fertilization the egg splits, the two embryos may develop spate placentas, and separate sacs. These types of identical twins are usually called dichorionic diamniotic twins. Most of the time however identical twins share a placenta, but two spate sacs in the placenta. These are called monochorionic diamniotic twins. All identical twins are genticaly similar, and shar a sing afterbirth.

Fun Facts:

-The only way to tell identical twins apart at a yound age is throug their belly-buttons

-The chance of having twins is much higher than it was 30 years ago

-Twins can have diffrent biological fathers

-Women who produce a lot of diary products is more likely to have twins

-Twins interact wiht each other in the womb

-Identical twins do not have similar fingerprints (a common misconception)