Psychology 1000 Lecture Notes - Lecture 11: Homo Sapiens, Phenotype, Tay–Sachs Disease
4 Jul 2013
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Normal development then: blind, deaf, unable to swallow. Rare dominant gene on autosome pair 4. Onset: 35-45 years: at first clumsy and forgetful, marked by progressive deterioration in: Terminal in 10-20 years: dominant -> offspring has 50% chance of acquiring, detection possible through gene mapping. Found on xx or xy: men are more susceptible than women. The y chromosome is short and less info on it. Most diseases are x linked, therefore women have a backup and men do not. Sex chromosomes: normal is xx or xy, can get xxx, x0, xxy. Down syndrome: 1 extra chromosome on 21st pair, marked by: Due to accumulation of amyloid protein (also in alzheimer"s patients) Can alleviate symptoms with intensive cognitive stimulation. Not hereditary, due to faulty meiotic division. Incidence related to mom and dad"s age: risk about 1 in 1000, past 40 years of age: 6 in 1000. Collapse timeline into 365 days where 1 day is 9. 6 million years.
