PSYC 100 Lecture Notes - Lecture 5: Behavioural Genetics, Gene Expression, Twin
2 Jun 2018
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PSYC 100 – Lecture 5
Biological Psychology
Genetic & Evolutionary Perspectives on Behavior
• Heredity & Behavior
o The genetic code
▪ Genes are the basic units of heredity; responsible for guiding the
process of creating the proteins that make up our physical
structures and regulate development and physiological processes
throughout the lifespan
▪ Genotype: the genetic makeup of an organism; the unique set of
’
▪ Phenotype: the physical traits or behavioral characteristics that
show genetic variation, such as eye color or personality etc.
▪ Chromosomes: structures in the cellular nucleus that are lined with
all of the genes an individual inherits
o Behavior genomics
▪ The study of DNA and the ways in which specific genes are related
to behavior
o Behavioral genetics
▪ The study of how genes and the environment influence behavior
▪ Monozygotic twins: come from a single ovum, which makes them
genetically identical
▪ D 2 … .
50% of their genetics in common
▪ Heritability: the degree to which genetic differences between
individuals contribute to individual differences in a behavior or trait
found in a population
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