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Lecture 6

Lecture 6.pdf


Department
Psychology
Course Code
PSYC 109W
Professor
V.Gordon Rose
Lecture
6

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PSYC 109W- Lecture 6
EVOLUTIONARY PSYCHOLOGY & NATURE/NURTURE
Basic principles of Genetics
Chromosomes:
Strands of DNA carrying genetic information
Human cells each contain 46 chromosomes in pairs (sex cells- 23 single)
Each chromosome- thousands of genes, also in pairs
Each parent contributes 23 chromosome pairs, which can be scrambled in over 8
million ways
Individuals share half of their genes with parents and full siblings
More distant relatives share smaller portions of genes
Identical twins share 100% of their genes
Most human characteristics are polygenic, or influenced by more than one gene
Genetic Overlap:
Identical twins- 100%
Fraternal twins/Sibling/Parent/Child- First degree relatives- 50%
Grandparent/Grandchild/Uncle/Aunt/Nephew/Half-sibling- Second degree relatives- 25%
First cousin- Third degree relatives- 12.5%
Second cousin- Fourth degree relatives- 6.25%
Unrelated- 0%
Twin studies of intelligence and personality: (Intelligence- McGue et al., 1993; Extraversion-
Loehlin, 1992)
Identical twins tend to be more similar than fraternal twins with regard to intelligence and
specific personality traits, such as extraversion
Findings suggest intelligence is influenced by heredity
EVOLUTIONARY PSYCHOLOGY
Based on Darwin’s ideas of natural selection
o Reproductive success key
Adaptations- behavioural as well as physical
o i.e. taste preference
Evolutionary Psychology
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