Pysch 236 Heritability Coefficient

Pysch 236 Heritability Coefficient - HERITABILITY...

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H ERITABILITY C OEFFICIENT W AYS TO STUDY HERITABILITY : F AMILY STUDIES , T WIN STUDIES , A DOPTION STUDIES H ERITABILITY C OEFFICIENT : ACCOUNTS FOR % OF GENETIC VARIABILITY H ERITABILITY = ( R MZ – R DZ) X 2 R = CORRELATION IDENTICAL TWINS ( MONOZYGOTIC ) SHARE MORE GENES THAN FRATERNAL TWINS ( DIZYGOTIC ), BUT MAY ALSO HAVE MORE SIMILAR ENVIRONMENT . F AMILY MEMBERS %’ S : P ARENT TO C HILD = 50% F ULL SIBLING = 50% H ALF - SIBLING = 25% F RATERNAL TWINS = 50% B EHAVIOR G ENETICS F OCUS : H OW ARE TRAITS PASSED ON ( INHERITED )? A DOPTION S TUDIES : INVESTIGATE HOW SIMILAR THE ADOPTED CHILDREN ARE TO THEIR BIOLOGICAL AND ADOPTIVE PARENTS H ERITABILITY C OEFFICIENT TELLS US : 1) G ENES MATTER 2) G IVES US INSIGHT INTO ORIGINS OF THINGS (E TIOLOGY ), MENTAL RETARDATION IS NOT HERITABLE , BUT MILD RETARDATION IS . 3) I NSIGHT INTO THE EFFECTS OF THE ENVIRONMENT , SHARED ENVIRONMENT ACCOUNTS FOR 5% OF PERSONALITY VARIATION . UNSHARED ENVIRONMENT ACCOUNTS FOR MUCH MORE PERSONALITY = DIFFERENT FRIENDS , DIFFERENT INTERESTS , DIFFERENT ACTIVITIES .
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