Formation of Identical Twins

Formation of Identical TwinsIdentical twins form when a zygote (egg/sperm combination) splits into two separate parts.

In the diagram, 1n represents half of the chromosomes that you have in each cell. Thus, 2n represents the complete number of chromosomes. You have a total of 46 chromosome.

1n = 23 chromosomes

2n = 46 chromosomes

While the two babies each have the same DNA, they do not always have  exactly the  same physical appearance.

The differences in identical twins is due to chemicals that activate or deactivate genes.

These chemicals are called epigenomes. The video below gives more information about genetic differences between identical twins.

For details about epigenomes, see HOW TO DEACTIVATE GENES.

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