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 the expression of genes, causing genetically identical individuals to have different traits. In this case, in utero exposure to certain chemicals can cause changes in epigenetic marks that modify the expression of genes related to fur color, leading to differences in the fur color of twins.

Researchers Studying Mice Have Found That in Utero Exposure to Certain