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TWIN FACTS

8th WONDERS OF THE WORLD

TWINS HAVE ALWAYS AMAZED ME.I FEEL THEY ARE ''THE LIVING WONDERS OF THE WORLD''

The Biology of Twins
Identical twins (monozygotic) result when a single fertilized egg splits after conception. The resulting twins are the same sex and genetically alike, with similar foot and hand prints, but different fingerprints and teeth marks. The egg then splits into two genetically identical halves. They share 100% of their genes. Fraternal twins (dizygotic) result when two eggs are released by the mother at the same time and each egg is fertilized by a different sperm. Fraternal twins can be of the same or opposite sex. They share up to 50% of their genes, and are no more alike or different than any two siblings would be, but there bond is just as special.

Half Identical Twins (Polar Body Twinning)
These twins occur when the mother's egg splits before fertilization and then each half is then fertilized by a sperm.

Twins of Two
They have different fathers and are formed when two eggs are released by the mother and each egg is fertilized by sperm from two different fathers.

Conjoined Twins
They are products of a single egg that for unknown reasons fail to divide fully into identical twins. One child in 50,000 is born connected to another. About 500 such babies are known to have survived their first year, and fewer than a dozen are living in the United States today.

Facts about conjoined twins

• Conjoined twins occur once every 200,000 live births.

• Forty percent to 60 percent of conjoined twins arrive stillborn, and about 35 percent survive only one day.

• The overall survival rate of conjoined twins is between 5 percent and 25 percent.

• Approximately 70 percent of all conjoined twins are girls. Although more male twins conjoin in the womb than female twins, females are three times as likely to be born alive.

• Conjoined twins are genetically identical and are, therefore, always the same sex. They develop from the same fertilized egg....


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