Facts about Identical Twins

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1.Identical Twins have same Genome
Since identical twins grow from one fertilized egg, they tend to have similar genome. Therefore, any differences that occur between identical twins are not due to genetics but are as a result of environment. Most differences that are induced by the environment are shown in the epigenome.

2.Identical Twins have Different Finger Prints
Though identical twins have similar genes, they do not have similar fingerprints because these are not generated solely based on genes. At conception, identical twins start off with identical fingerprints but during the 6th to 13th week of development, they begin moving and come into contact with the amniotic sac. Unique lines and ridges form on their hands that lead to different sets of fingerprints.

 3.Identical Twins are Direct Reflection of each other
25% of identical twins grow while facing each other directly. This means that they develop to become a direct reflection of each other and can be left and right handed or their birthmarks may appear on opposite sides. Their hair whorls can also swirl in opposite directions. Usually, this happens when twins develop from a single fertilized egg more than one week from conception day.

4.There are more twins in Massachusetts than any other State
The state of Massachusetts leads in terms of twin births within the United States. An approximated 4.5% of all live births are twin births. New Jersey and Connecticut follow with a 4.2% twin birth. Researchers attribute the high rate of multiple births in Massachusetts to the affluent towns located on the outskirts of Boston where there is a high wealthier women concentration whose careers are well established. Such women most likely get children in later years and acquire reproductive assistance. New Mexico has the lowest twin birth rates in the U.S.

 5.Identical Twins and Bipolar Disorder
Identical twins born of parents with bipolar disorder don not always develop bipolar disorder irrespective of the fact that identical twins share the same genes. According to research, there are other factors besides genetic composition that determine whether one develops the disorder or not. Such factors include environment and other genes though scientists are not clear how such factors lead to bipolar disorder.

 6.Conjoined Twins are often Identical Twins
Conjoined twins are identical twins with the same genes and are always of same sex. They develop from a single fertilized egg and share the placenta and amniotic cavity. Conjoined twins result when an egg does not separate fully after fertilization. Usually the embryo begins to split in the initial weeks following conception but stops before separation is complete.  This partially separated embryo then develops into a set of conjoined twins.

 7.Some Conjoined twins can Taste and Feel the same
Conjoined twins may share a heart, internal organs such as liver and intestines or the head. Tatiana and Krista Hogan, a set of conjoined twins attached at the head via a thalamic bridge that filters sensory inputs were able to understand the thoughts of each other as well as feel and taste what the other twin was experiencing.

 8.Twin Babies Develop Unique Languages
40% of twin babies tend to develop a language by modeling each other in the absence of an adult. This language often features onomatopoeic expressions and inverted words and is formed when identical twin babies begin learning how to speak.

 9.Mothers  to twins live Longer
Women who mother twins tend to be healthy and very strong, an attribute that makes them live longer. Twins are evolutionary and healthy moms get the opportunity to pass on double genes in one instance.

 10.Rising Number of Twins in the U.S
The number of twins born in the U.S. increased by 76% between 1980 and 2009 as older women beyond 30 years of age use reproductive technology and fertility drugs to have children.

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