A single egg is fertilized by a single sperm in the first method. The basics of reproduction, aren't they? However, at some point in the process, the fertilized egg splits in half, giving rise to identical twins.

Having identical twins is a relatively uncommon occurrence, occurring in only three to four out of every 1,000 births. Irrespective of how obvious it may seem, identical twin babies are not always of the same gender, either male or female. Why? The two of them aren't just strikingly similar in appearance — they also share the same DNA.

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