PSY 1102 - Chapter 3

PSY 1102 - Chapter 3 - k s osomes, 30,000 genes, 3 billion...

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Unformatted text preview: k s osomes, 30,000 genes, 3 billion pair s of nucleotides. ticists explor e individual differ ences using option studies ament studies f tr aits and disor der s ation among individuals is due to their differ ing genes) tur e influence developing per sonality pidly after bir th and ar e dependent on exper ience. ely in per sonalities and abilities as do childr en pair ed at r andom heir home envir onments Chapter 3: Nature & Nu rtu re of Behaviour Nature and nurture are both crucially important Genes and culture matter GENES: OUR BIOLOGICAL BLUEPR I NT Chromosomes: threadlike structures made of DNA molecules that contain the genes; coiled chain of DNA. I.e. Y chromosome (50 million nucleotides), chromosome 1 (250 million nucleotides) DNA : two strands held together by bonds between nucleotides that form a double helix; contain the genetic information that makes up the chromosomes. Genes : biochemical units of heredity that make up DNA (which make up chromosomes). Blueprint for protein molecules, building blocks of physical and behavioural development. o ~ 30 000 genes o Composed of nucleotides o 3.1 billion nucleotides in the human body (sharing 95% of sequence with chimps) o A, T, C, G Genome : complete instructions for making an organism, consisting of all the genetic material in its chromosomes. o Small variations in DNA are responsible for each persons uniqueness Gene Complexes: many genes acting in concert that influence human traits i.e. the genes that affect your height affect the length of your face, neck, legs. EVOLUT IONARY PSYCHOLOGY: MAX I M IZ ING F I T NESS Nature selects advantageous variations Natural selection : the principle that the inherited traits that lead to increased reproduction and survival will most likely be passed on to succeeding generations I.e. resistant bacteria multiplies rapidly Natural Selection and Human Tendencies Behavioural similarities arise from our biological similarity. i.e. Joy brings about the same facial expressions from people worldwide- 6% difference among races- 8% difference within a race- 85% difference within communities Mutation: a random error in gene replication that leads to a change in the sequence of nucleotides ; the source of genetic diversity. Genes and Environment together wire the brain Evolutionary psychologists: the study of the evolution of behaviour and the mind, using principles of natural selection. Natural selection favours genes that solved adaptive problems faced by our ancestors that contributed to their survival and thus, the spread of their genes. i.e. fear of snakes = more likely to survive. SEXUALI TY Gender : characteristics, whether biologically or socially influenced, that people use to define male and female....
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PSY 1102 - Chapter 3 - k s osomes, 30,000 genes, 3 billion...

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