Researchers studying mice have found that in utero exposure to certain chemicals can cause genetically identical twins to have different colored fur.This is best explained by the fact that genetically linked traits can be modified by

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Epigenetic marks can modify gene expression and lead to different phenotypic outcomes in individuals with identical DNA sequences. In this case, chemicals in utero may have led to changes in the epigenetic marks of the mice, resulting in different fur colors despite having the same genetic material.

Researchers Studying Mice Have Found That in Utero Exposure to Certain