Unit 3C AP Psychology

Behavior Genetics

the study of the relative power and limits of genetic and environmental influences on behavior


Every non-genetic influence, from prenatal nutrition to the people and things around us


Threadlike structures made of DNA molecules that contain the genes


A complex molecule containing the genetic information that makes up the chromosomes


The biochemical units of hereditary that make up the chromosomes; segments 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

Identical twins

twins who develop from a single fertilized egg that splits in two, creating two genetically identical organisms

Fraternal twins

twins who develop from separate fertilized eggs. They all genetically no closer than brothers and sisters, by they share a fetal environment.


The proportion of variation among individuals that we can attribute to genes. The heratability of a trait may vary, depending on the range of populations, and environment studied


The interplay that occurs when the effect of one factor depends on another factor

Molecular Genetics

the subfield of biology that studies the molecular structure and function of genes

Evolutionary psychology

the study of the evolution of behavior and the mind using principles of natural selection

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


A random error in gene replication that leads to a change