If you are asking how identical twins are conceived, it is due to a splitting of the ball of cells some time after fertilization occurs. In this scenario, one sperm fertilizes one egg. Because the twins come from the same sperm and egg, their genetic material is identical and that is why only same-sex identical twins can be born.
If you’re wondering about how twins can have completely different personalities despite their identical appearance, the general explanation is a difference in environment. However, new research has emerged that differences can also be attributed to their epigenome. When twins are born, they have the same epigenome but differences begin to emerge as they get older and spend time living apart. Since epigenetic marks are lost naturally and randomly as people age, it is expected that twins will have differences in what’s lost.
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