Chapter 4. Genetic influ on behav

heredity of intelligence

if IQ is genetically deter, people with the same genes would have equal IQs. In reality genes account only for 50-70%

IQ correlation

PIC

Reaction Range

range of possibilities that genetic code allows, inherited range for potential expression, enviro effects deter where person falls within these limits

Reaction range pic

Big circle where they actually end up

Heredity of Personality (we need to study)

1. genetic contribution

2. shared family environment

3. unique indiv experinces

Heredity of personality (four groups)

1. identical twins reared together

2. Identical twins reared apart

3. fraternal twins reared together

4. fraternal twins reared apart

Personality traits pic

1. openness (play pretend)

2. conscientiousness (can depend on)

3. extraversion-introversion (extrovert and introvert)

4. Agreeableness (co-op)

5. Neuroticism (how emotionally unstable you are)

Twin study pic

genetic factors- 39 to 58%

unique experiences - 36 to 56%

familial enviro little to no effect

evolutionary psy

how have behav and action evolved in response to enviro demands? based on theory of evolution

Theory of Evolution

slow change in genes (therefore characteristics) of a pop over time

population an interbreeding set of indiv

changes occur due to heritable genetic mutations

Natural selection

heritable chara that increase yout likelihood of surviving remain in pop and become more common over time! you dont die therfore you pass on more genes that those that die! Adaptations the traits that occur due to natural selection

Natural selection PIC

The human brain

Growth in areas connected to to increase iq, link to cortex of brain, evo of behav impact by culture

Type of adaptation

1. Broad, wide use like lang, skill used many ways

2. Domain specific, solve specific prob like mating and peacock feathers

Social adaptions in people

Inate ability lang, responsive to people’s face, group seeking behaviour, some uni emotions

Parental investment

Time effort energy used to raise child. Low children more invest like humans, lots of kids less invest like turtles

Two parents may not care equally for child , sex differences equal reasons for mating patterns

Mating systems

More comp for the partner that puts in more parental investment, highest invest will be more picky,

Monogamous

Equal parenting invest, limited dimorphism btw sexes, arise cause one parents can’t successfully raise child alone humans and birds

Polygamous

Unequal contribution

Polyandry

One female many males, all fight for her attention, competition drives mating peacock

Polygyny

One male many females

Polygynandry

Many males many females equal every sexing everyone and raise like village

Mate preference 1

Mate pref 2

Cooperation

One individual helps so another will help them later

Altruism

One indiv helps but there’s no reward back. Save baby from hit by bus but I die

Kin selection theory

Helps relatives survive, more like to help them if you helped, help with similar genes like parents kids but not niece

reciprocal alt theory

Contrib to long term co op, oh they saved my kid let me give them money

Katmiss barries rue, district nine gives her food in return

Positive relation in kin theory

If theory true wE should help fam more and this is fact there is a positive relation

Aggression

Protect mate, your kid, territory or food. Take or gain resources. We evolved to this

Dominance hierarchy

We rember who kicked our ass or others ass so we don’t mess with them. Strongest at top. If we fought all we would be fucke up hashtag pecking order

Pitfalls Genetic determinism

false idea that genes are concreate and unchangable

Social Darwinism

False idea that those at top of hierarchy are the best. May only be best at that or haven’t been over thrown yet

Defend status quo

We do things like this so right. Queens using instest. Some gene don’t show up bad till after mating age