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

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Presentation on theme: "Do Now Why do you think genes play a role in behavior?"— Presentation transcript:

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)


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