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There are two different types of twins:
Dizygotic= fraternal or non-identical
Monozygotic= identical
Fraternal twins happen when two separate eggs are released at a single ovulation and are fertilized by two different sperm. These two fertilized eggs then implant independently in the uterus. Fraternal twins share the same type of genetic relationship as non-twin siblings. These are also the most common form of twins; a reason for having fraternal twins is the age of the mother at conception. The chance of fraternal twins is more prevalent in women 35 years of age and older. And yet another growing cause of fraternal twins is the use of fertility treatments.
Identical twins develop when one egg is fertilized by a single sperm and during the first two weeks after conception, the developing embryo splits into two. As a result, two, genetically identical babies develop. The exact reason why identical twins happen is still a mystery. Over the years there has been a lot of research and time invested into finding out why some zygotes split into two and others don’t. But the truth is we still do not know why. In reality, the splitting of one fertilised egg is a malformation of the natural processes of conception.

Twins are very valuable to scientific research because they allow researchers to study the relative importance of environmental and genetic influences on people. In other words, how much of someone's personality and appearance is based on their environment and how much is based on the genes from their parents. Twin studies compare the similarity of monozygotic (identical) and dizygotic (fraternal) twins. If identical twins are considerably more similar than fraternal twins it shows that genes are important.
Twin studies have shown that a person's genes influence almost all traits, with some characteristics showing a strong influence (e.g. height) and…...

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