unit iii: biological bases of behavior · biological bases of behavior module 14 behavior genetics:...
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Unit III:Biological Bases of Behavior
Module 14
Behavior Genetics: Predicting Individual Differences
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Genes & Behavior Genetics 14-1
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Behavior Genetics: Predicting Individual Differences
Behavior genetics is the
study of our differences
and the relative effects of
heredity and environment.
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Genes: Our Codes for Life
Segments within DNA
consist of genes that make
proteins to determine our
development.
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Genome
Genome - the common
sequence within human DNA.
It is this shared genetic profile
that makes us humans, rather
than chimpanzees or tulips
The Human Genome Project (an international 13-year effort) was completed in 2003. The project’s goals were to determine the complete sequence of the 3 billion DNA sub-units, identify all human genes, and make them
accessible for further biological study.
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Twin and Adoption Studies 14-1
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Separated Twins
Separated Twins
Personality, Intelligence
Abilities, Attitudes
Interests, Fears
Brain Waves, Heart Rate
A number of studies compared identical twins reared
separately from birth, or close thereafter, and found
numerous similarities.
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Studying Identical Twins 14-1
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Biological vs. Adoptive Relatives
Adoption studies suggest that adoptees (who may be
biologically unrelated) tend to be different from their
adoptive parents and siblings.
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Molecular Genetics 14-2
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• Molecular genetics studies the molecular structure and function of genes
• Find the genes that together orchestrate traits or reveal at-risk populations for diseases
14-2Molecular Genetics
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Heritability 14-3
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Heritability
Heritability is the extent to which
variation among individuals can
be attributed to their
differing genes.
Heritability focuses on the differences between multiple organisms for a single trait. It is a description of a certain
population - not an individual.
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Gene-Environment Interaction 14-4
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Gene-Environment Interaction
Genes can influence traits
which affect responses, and
environment can affect gene
activity.
A genetic predisposition that makes a child restless and hyperactive evokes an angry response from his parents.
A stressful environment can trigger genes to manufacture neurotransmitters leading to depression.
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Epigenetics studies the molecular mechanisms by which environmental triggers can switch genes on or off.
Epigenetics 14-4