Examlex
The Culture and Human Behavior box "Where Does the Baby Sleep?" describes cultural differences in family sleeping habits. In the study described in the box, how did the bedtime routines in Mayan families differ from the bedtime routines of U.S. families?
Twin Studies
A research method in which researchers assess hereditary influence by comparing the resemblance of identical twins and fraternal twins on a trait.
Hereditary Influences
The impact of genetic factors inherited from parents on an individual's traits, behavior, and health.
Identical Twins
Twins that develop from a single fertilized egg that splits and forms two embryos, sharing 100% of their DNA.
Fraternal Twins
Siblings born at the same time but are the result of two different eggs fertilized by two different sperm, sharing about 50% of their DNA, similar to ordinary siblings.
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