the study of the relative power and limits of genetic and environmental influences on behavior
the biochemical units of heredity that make up the chromosomes; a segment of DNA capable of synthesizing a protein
the complete instructions for making an organism, consisting of all the genetic material in that organism's chromosomes
twins who develop from a single fertilized egg that splits in two, creating two genetically identical organisms
twins who develop from separate fertilized eggs. They are genetically no closer than brothers and sisters, but they share a fetal environment.
The proportion of variation among individuals that we can attribute to genes. May vary, depending on the range of populations and environments studied.
the interplay that occurs when the effect of one factor (such as environment) depends on another factor (such as heredity)
the subfield of biology that studies the molecular structure and function of genes
the study of the evolution of behavior and the mind, using principles of natural selection
the principle that, among the range of inherited trait variations, those that lead to increased reproduction and survival will most likely be passed on to succeeding generations
in psychology, the biologically and socially influenced characteristics by which people define male and female
the enduring behaviors, ideas, attitudes, and traditions shared by a group of people and transmitted from one generation to the next.
giving priority to one's own goals over group goals and defining one's identity in terms of personal attributes rather than group identifications
giving priority to the goals of one's group (often one's extended family or work group) and defining one's identity accordingly
the sex chromosome found only in males. When paired with an X chromosome from the mother, it produces a male child.
the most important of the male sex hormones. Both males and females have it, but the additional amount of it in males stimulates the growth of the male sex organs in the fetus and the development of the male sex characteristics during puberty
a set of expectations (norms) about a social position, defining how those in the position ought to behave