ABOUT TWINS (yani judwa bacho k bara ma asal haqeeqat)

About Twinsssss                           

By Mubeen Qamar

Identical twins occur when one fertilissed embryo splits to form two individuals.
Identical twins are genetically the same ; however ,this does not mean that everything abut them will be
exactly the same . For example , while the fingerprints of identical twins are more alike than the prints of two 
completely unrelated people . they are not identical.
Identical twins are always the same sex; they usually are the same height, weight and have similar hair
 color. In relation to the genetic differences in MZ twins, different genes can be turned on or off which is why one identical twin may have a condition or disease that the other doesn’t. The differences are due to a number of natural chemical modifications that can influence changes to DNA – called epigenetics. Researchers have found that epigenetic changes in twins' genomes (their entire hereditary information) increase as the twins' age and become greater the longer they live apart. Common differences relate to features such as birthmarks, moles, hair patterns and teeth development. Aside from physical differences, there can be even greater differences in their personalities.  

Dizyjotic DZ :

Non-identical twins occur when two separate eggs are released by the mother at the same time and are fertilised by two different sperm. These two fertilised eggs then implant independently in the uterus. DZ twins are genetically similar – just like normal brothers/sisters/siblings in that they share approximately 50% of their genetic material. DZ twins are still very special because they share the same womb and have very similar environments as they grow throughout life. 
by Mubeen Qamar

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