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Lecture

Lec06_140117.pdf

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Department
Statistics
Course
STAT151
Professor
Gregory Wagner
Semester
Winter

Description
BIOL207 B01 Lec06 2013-01-18 CHAPTER 3 (cont’d) A. Environmental Influences a. phenotype of some genotypes depends on the environment b. relationship is most easily studied by measuring variation in a population (VP= V G V )E VP= phenotypic variance VG= genotypic variance VE= environmental variance more complicated models also exist, e.g. (VP= V G V +EV G×E) 2 c. quantify heritability (h ) as: 2 h = V GV P if environment has no influence, h = 1.0 (complete heritability) 2 if genotype has no influence, h = 0 (no heritability) 2 d. can measure h , V G V Ey controlling either environment or genotype or both e. twin studies are alternative for human subjects, since can’t contrGl V E V experimentally monozygotic (identical) twins : VG= 0 dizygotic (fraternal) twins :GV ~ 0.50 Robert Plomin BBC4 interview; exam scores in twin studies http://www.youtube.com/watch?v=suQ4-2p929E http:/
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