PSYC 2240 Chapter Notes - Chapter 4: Ischemia, Prefrontal Cortex, Occipital Lobe
12 Sep 2016
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Sex-limited genes: present in both sexes, mainly active in one sex. Acetyl groups attach to histones, causing them to loosen, facilitating expressions, removal of this turns gene off. Epigenetics: changes in gene expression without changing the dna sequence. Phenylketonuria (pku): genetic inability to metabolize the amino acid phenylalanine. Humans have protein that transport glucose to brain as opposed to muscles in chimps. Kin selection: selection for a gene that benefits the individual"s relatives. Reciprocal altruism: we help those that will return the favou. Nervous system beings to form at 2 weeks, we make first movements at 7. 5 weeks, birth brain is 350g, end of first year 1000g, and adult is 1200-1400g. Nearly all neurons form within first 28 weeks of gestation. Neurons migrate, immonoglobulins + chemokines guide neuron migration. Synaptogenesis: formation of synapses, this process continues throughout life. Humans can develop new neurons very slowly, but other animals can more.
