10.5

Question 1

genetics and intelligence is the influences of _____ interacting intimately with ____ and other _____ ________ to produce a _____

Answer 1

heredity(biological inheritance from parents)
experience
environmental factors
result

Question 2

heritability estimates how much of the _____ in a ____ observed in a _______

Answer 2

variability
characteristic
population

Question 3

if genes have no role in variation, the heritability is ___ (likelihood ppl born with tattoos)

Answer 3

heritability is 0

Question 4

heritability of IQ is __, measured by IQ tests

Answer 4

around .75

Question 5

what does the heritability of intelligence mean?

Answer 5

that 75% of the VARIANCE in intelligence in a population is attributed to genetics
Note: this does not concur that 75% of the individiual’s intelligence is due to their genes

Question 6

overall brain size and proportion of gray matter are correlated with intelligence, both are approximately __ % heritable

Answer 6

85

Question 7

does this mean we have “gene” for intelligence due to high heritability?

Answer 7

it is more likely that as many as over 1000 differnt genes (polygenetic trait) influence intelligence
Note: small impact from each gene, prbly at different times of development, many during prenatal development

Question 8

PKU and intelligence

Answer 8

PKU is a condition, and left unchecked, can impact one’s intellectual ability

Question 9

what illustrates the potential change for intelligence?

Answer 9

Increase in IQ score 3 points / decade in last 100 years - Flynn effect: too fast to be genetic development / change.
=> environmental influences

Question 10

what are some environmental factors?

Answer 10

• nutrition!
• exposure / access to mentally stimulating activities
• socioeconomic status
• access to resources and education