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The social mother as biological mother.

Egg donation constitutes a meeting of heredity and environment, both of which can be explained in terms of biology. There is much to suggest that the intrauterine and postnatal environment, but also the environment of upbringing, trigger epigenetic, chemical reactions that change the gene expression in the child. The social mother who carries the child in utero imparts to it a biological similarity to herself, which has a bearing on the child’s mental health and intellect.