PSYCH 2AA3 Lecture Notes - Lecture 2: Cerebral Cortex, Critical Period, Epigenome
21 May 2016
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Document Summary
46 chromosomes (23 complete pair) gametes (eggs & sperm) have 23 (single-unpaired) chromosomes each chromosome contain dna, which contains pairs of nucleotide bases (a- T; g-c) a gene is a group of nucleotide bases that provides a specific set of biochemical instructions genes come in different forms called alleles homozygous (dominant vs. recessive); heterozygous incomplete dominance (i. e. sickle cell anemia) Branch of genetics that deals with inheritance of behavioural and psychological traits i. e. genes for tall height but malnourishment due to environment result in shorter height i. e. genes for serotonin use > depression. Genotype: genetics makeup of a cell (i. e. aa; aa; aa) Polygenic inheritance many genes used to determine characteristics; allows for variability. Many possible combinations, most common would be average height. Genes and environment work together and affect one another. Epigenome does not change dna, but decides how much or whether some genes are expressed.
