PSY 2105 Chapter Notes - Chapter 3: Twin Study, Sickle-Cell Disease, Color Blindness
27 Sep 2016
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Chapter 3 genetics: the biological context of development. Dominant = normal colour vision, freckles, dimples, free earlobes. Recessive = colour blindness, no freckles, no dimples, attached earlobes. Dominant disorders: huntington"s chorea: nervous system degenerates in adulthood. Tay-sachs disease: nervous system disintegrates because the body cannot break down fats in brain cells. Pku: inherited disease in which the body cannot process phenylalanine: no errors in metabolism. Sickle cell anemia: red blood cells cannot transport oxygen due to physical deformity. X-linked disorders: hemophilia: bleeding disorder, duchene muscular dystrophy (ms, red-green colour blindness, fragile x syndrome. Autosomal: down syndrome: triploidy on 21st pair of chromosomes. Somatic: fragile x syndrome: abnormal gene on x chromosome mental retardation, turners syndrome: when female only has one x (xo, klinefelter"s syndrome: when male has extra x (xxy) Concordance is the degree of similarity of the twins on behaviour: twin and adoption studies comparing twins separated at birth that were adopted.
