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How do adoption studies investigate genetics and environmental influences?
Adopted or foster children share none of their genes with their adoptive parents, but they do share 50 percent of their genes with their natural mother.
if the heritability of a behavior is high and environment has little part to play, then the behavior of adopted children should correlate more strongly with the behavior of their natural mother than their adoptive mother.
If, however, the environment has the strongest role to play, the reverse pattern should be found.?