nature and nurture. qotd megan rosa what do you think has a bigger impact in peoples lives in making...
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Nature and Nurture
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QOTD
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Megan Rosa
What do you think has a bigger impact in peoples lives in making them who they are?
A. Nature (environment)
B. Nuture (genes)
C. They are even
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Alexandra Chrostowski
If falling in love and sustaining long term relationships aren't "evolutionarily necessary" for reproduction, why do you believe we have it in modern society?
A. It is emotionally necessary
B. Finding love is our way of seeking the "best mate”
C. There is some kind of evolutionary relevance to it
D. Love is pointless for survival and doesn't really exist
E. Other opinions?
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The Big Questions
How is evolution even possible, and what are genes, alleles, heritability, etc?
How much of our behavior is genetic, and how much is environmental?
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Humans developed from earlier species of animals
A. True
B. Not Sure
C. False
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Evolution?
How does a fish EVER give birth to something other than a fish!?
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Hard to Fathom
It took a long time (longer than you can imagine!)
- very, very gradual change..
We don’t think of ourselves as cells:
- at the cellular level, fish ≈ people!
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Evolution and Lego
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The same parts, reconfigured..
Evolution operates on an elaborate “instruction booklet” for constructing bodies from basic building blocks – the instruction book is subject to random and powerful hacking..
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Fast Forward..
https://www.youtube.com/watch?v=z9ptOeByLA4
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The Instructions
Genes = Lego instruction pages Base pair (G,C,T,A: Gattaca, nucleotide)
3 = one Lego brick (amino acid)
Gene = Protein = sequence of amino acids (~300 = ~900 bp’s, but genes ~27,000 bp)
Alleles = different instructions for different folks..
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The Instructions
Genes = Lego instruction pages Only 1.5% of human DNA codes for proteins,
~20,000 proteins in all (like most animals)
Between 20-85% of DNA may be “junk”
Rest is regulatory / control: if, then, else, for, while, etc of the genetic program!
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98.8% Human?
Proteins largely the same, but regulatory / junk areas differ by ~5%
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Chromosomes etc
2x of everything: mom + dad = 2
Dominant vs. recessive: DD, Dr, rD, rr =¾ dominant, ¼ rec.
All the bad stuff is recessive: why incest is risky!
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Genes and Behavior
Genome-Wide Association Study (GWAS) for IQ: No single gene explains much, but if you put them all together, ~50% heritable.
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Heritability
h2 = proportion of variance explained by genetics
Variance depends on the population you measure!
h2 much higher in WEIRD populations (western, educated, industrialized, rich, democratic) because variance is lower!
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Behavioral Genetics is Big at CU
http://www.colorado.edu/ibg/home The Colorado Adoption Project The Colorado Twin Registry The Colorado Learning Disabilities Research Center
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Were you a “geek” or a “nerd” in High School?
A. Yes
B. No
C. Define “geek” / “nerd”..?
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For the geeks / nerds
Was this part of your “identity”, causing you to seek out other like-minded individuals, and pursue commensurate activities?
A. Yes
B. No
C. Define “activities”..
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Gene / Environment Correlations
Overestimate heritability because genes influence environments!
Geeks seeking geeks to do geeky things which makes them even geekier, and thus more likely to rule the world!
And, yes, non-geeks shunning said geeks, further reinforcing said geekiness (reactive vs. active).
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Everything is a Nature/Nurture Interaction
Can’t be smart if you can’t eat. Parents give you genes and, for most, your
early environment (c.f., twins reared apart!) Brain is highly plastic (adaptive): h2 of IQ gets
larger over time: it’s about learning!
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Evolutionary Psychology
Let me tell you a story about this caveman friend of mine..
If you weren’t there, you don’t know what the real evolutionary forces were! (mostly “just so” stories / b.s.)
Except really obvious things, like sex, violence (raping, pillaging: whose idea was that!?) Chimpanzees show same in-group / out-group
behaviors as people..