PSYA01H3 Study Guide - Final Guide: Adrenal Gland, Sympathetic Nervous System, Electrophysiology
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3. 1 genetic and evolutionary perspectives on behavior: genes and experience are never independent. If two corresponding genes at a given location on a pair of chromosomes are the same, they are referred to as homozygous. It was far more likely for both monozygotic twins to show symptoms than for both dizygotic twins to do so. In contrast to the results of the twin study, another study found that heritability for intelligence increases with age. Animals of many species use coloration as a way to attract the attention of potential mates, and those who are most colorful are often preferred. One cue upon which both men and women base their feelings of attraction is the symmetry of the face. At the end of the axon are axon terminals. Located within the axon terminals are chemicals called neurotransmitters, the chemicals that function as messengers allowing neurons to communicate with each other.