"Since all male brain cells contain X chromosomes of maternal origin, they will be obliged to express these particular genes. Females share this possibility of having maternally expressed X-linked genes, but they will also have paternally expressed X-linked genes in the brain. Through X inactivation, the female brain will typically express the genes of only one X chromosome within a cell. The resulting random pattern of alternating maternal and paternal X-linked gene expression in the female brain is called mosaic expression. In direct contrast, males are obliged to express maternal X-linked genes." - Dr. Cykowski's lecture on "Sexual Differentiation of the Nervous System"
Could this explain the mama's boy/daddy's girl phenomenon?
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I like the article below .. even though it's 3 weeks after you posted.
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