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PSYC 100
Ingrid Johnsrude

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WEEK 14 LECTURE NOTES: GENETICS AND INTELLIGENCE The basic unit of heredity is called a 1)gene b)chromosomes c)genome d)DNA molecule How do nature and nurture interact to affect development? -->nature: genes we receive from our parents -->nurture: all of the physical and social environments we are exposed to Genotype: the nucleus of every cell contains 23 pairs of chromosomes -genes are sections of the chromosomes -each gene is a segment of the DNA that codes for the production of one particular protein -22 of these pairs roughly equal and carry same gene sequences relevant to same traits -genotype: the complete set of genes that you inherit from both parents -phenotype: the observable expression of your genotype including both appearance and behavior; phenotype affected by environment even before conception -exposure in utero influences phenotypic expression -most human genetics traits depend on a combination of genes together Heritability: the degree to which the variability of a particular trait in a particular pop'n is a result of genetic differences among those organisms; describes broad groups of pop'ns -not individuals but groups -intelligence studied a great deal: heritability of 50% -genes code for proteins -only applied to a particular group living in a particular environment at a particular point in time Behavioral Genetics -study environmental and genetic contributions -twin studies (differences greatly influence how genes are expressed) On average, behavioral-genetics studies estimate the heritability of intelligence to be: a) about 0.90 b)about 0.20 c)low at all ages d)higher for adults than children -as an adult, we're less influenced by early-childhood cues, and more by genetic cues; we start to pick our own niches, based on what suites us betteR) Intelligence an individual's abili
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