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Lecture 10

Psych lecture 10 October 15th.docx

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Psychology 1000

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th Psych lecture October 15 , 2013 • Adaptation and selection • Aggression • Weapons effect Next time: statistics! Scan appendix Note: • Make sure to know that identical twins reared apart are 0.72 • Huntington’s – dominant, so the offspring has a 50% of acquiring the gene but detection is possible through gene mapping Sex – Linked disorders (multiple gene disorders) • Found on chromosome pair 23 • Found on XX or XY • Men are more susceptible to them than women, less info on the Y chromosome: o Causes baldness o Red, green colour blindness o Hemophilia Normal is XX or XY but you could get • XXX • X • XXY • XYY (super aggressive chromosome and found a lot in prison, not completely true) Down syndrome • 1 extra chromosome on the 21 pair • Marked by o Nervous system abnormality o Mild to moderate impairment o Shorter life span o Physical appearance (mongolism) Downs is due to the accumulation of Amyloid protein (also in Alzheimer’s patients) • Note: Can alleviate symptoms with intense cognitive stimulation!! 1. It is not hereditary…due to faulty meiotic division (sticky chromosomes) 2. Incidence related to mother’s (and dad’s) age risk…about 1 in 1000; with the first baby occurring past 40 raises the risk to 6 in 1000 Evolution Collapse timeline into 365 days 1 day = 9.6 million years • Jan 1 – life begins • Feb – Oct – not much th • December 11 – mammals • December 19 – birds • December 24 – primates st • 11:54pm on the 31 – Homo sapiens Adaptation • Changes to meet environmental needs (functionalist perspective) • Proximal (immediate mechanisms) vs. distal causes (evolutionary processes) Tinbergen: What causes aggression? 1. Given that an adult animals fights now and then, what makes each outburst happen? a. Proximal question – asking about now 2. How has the animal, as it grew up developed this behavior? (proximal question) 3. How has the species we observe today acquire the particular behavior systems during evolution? (distal question) Note: functional approach is very powerful and ultimately everything is due to genetics? But… phenotype does not equal genotype • Traits not necessarily due
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