The fact that some monozygotic twins are not a similar size is support for the basic concept that height is not a heritable trait.

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Monozygotic twins share the same genetic makeup, so differences in their size suggest that environmental factors, not genetics, are influencing their height. This does not mean height is not heritable; rather, it shows that both genetics and environment play a role in determining height.

The Fact That Some Monozygotic Twins Are Not a Similar