PSYCH 100 Lecture Notes - Lecture 6: Down Syndrome, Behavioural Genetics, Twin Study
Document Summary
Psych 100 -- lecture 6 -- chapter 5 (nature, nurture, and human diversity) Edward thornedike: in the actual race of lifethe chieft determining factor is hereditity. Watson: give me a dozen healthy infantsi"ll guarantee to take any one at random and train him to become any type of specialist i might selectregardless of his talents, penchants, tendencies, abilitiesand race of ancestors . Truth is in between, but not necessarily in the middle. Nature and nurture account for amost all human traits to one degree or another. Genes: basic units of heredity; coded instructions to carry out genetic characteristics. 46 total (for a normal , healthy person) Same parents but siblings can be very different from one another. Dad"s sperm contributes either the extra x or a y. Xs are more powerful (more characteristics on them) 3 of the 21st chromosomes instead of 2. Dominant - dominant = dominant trait expressed. I. e. brown over blonde hair, brown over blue eyes.
