1. Do Now
Why do you think genes play a role in behavior?

2. Unit 3C : Genetics, Evolutionary Psych, and Behavior
Behavior Genetics: Predicting individual differences

3. Introduction Behavior genetics Heredity versus the environment
Environment = non-genetic, things around us
EX: school
Study of how genetics + environment = influence behavior

4. Codes for Life Chromosome DNA Genes Genome Lets break it down
Active vs. inactive
expressed vs. carrier
Dominate vs. recessive
Genome
Lets break it down

5. Chromosomes
Threadlike structures made of DNA molecule that contain genes
Baby usually has 23 pairs of chromosomes (46 total)

6. DNA – deoxyribonucleic acid
A complex molecule contain genetic information that makes up chromosomes

7. Genes
The biochemical units of heredity tat make up chromosomes; segments of DNA capable of synthesizing a protein

8. Inactive vs. Active Genes
Inactive = we carry the trait/gene but it is not displayed
Active = we carry and do display

9. Genome Genome Human Genome Instructions for making something
All the genetic material in an organism’s chromosomes
Human Genome
The shared genetic sequence that makes us humans instead of chimps or tulips

10. Twins Identical Fraternal Look the same The same genetic make up
1 sperm and 1 egg made 2 babies during cell division
Fraternal
Like any other siblings
Share a birthday
2 sperm and 2 eggs made 2 babies

11. During cell division it splits and becomes
Identical
Fraternal
2 sperm
2 eggs
2 babies
gender doesn’t matter
don’t look alike
1 sperm
1 egg
During cell division it splits and becomes
2 people
Same gender
Look alike

12. Twin Studies – Jim Twins
University of MN studied identical twins separated at birth
Jim Twins
Raised in different households
Didn’t know about the other
Similarities between the two
Suggested that genes influence personality

13. Biological Vs Adoptive
Genetic Relatives
Those whose genes you have
Environmental Relatives
Those that raise you
Impacts on PERSONALITY
biological/genetic influence personality regardless on environment
Heredity shapes personality
Parents (bio or enviro) influence;
Attitudes
Values
Morals
religion/politics

14. Heritability Heritability
How much of our difference as people are because of our genes
EX: intelligence when two people are raised the same
Helps explain differences
Heritability of a trait can vary based on environment and the population studied

15. Heritability – Group Differences
Heritable differences between individuals does not imply heritable group differences
Height differences can be because of genes
Why people are taller today than 100 years ago? Is it genes
NO!! Its nutrition
Heritability can explain individual differences not group differences

16. Nature and Nurture Genes are self-regulation
Nature and nurture work together
Genes and experience interact
EX: cute babies (genes make you cute) get more attention from strangers (environment)

17. Molecular Genetics Molecular Genetics Molecular behavior genetics
Looking for genes that influence weight, sexual orientation, extraversion…etc.
Genetics and diseases
Things like Down Syndrome

18. Today
Questions?
Begin HW
HW = #s 4-6 (Evolutionary Psych)