10.19.07

# 10.19.07 - Dr Susan Foster BIOL 105 Evolution 10.19.07 I...

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Dr. Susan Foster BIOL 105 – Evolution 10.19.07 I) Heritability 1) Can be thought of as the tendency of offspring to resemble their parents because of genetic similarity (i) Study at University of Washington on parent/offspring height Measured parent height Calculate average = Midpoint value Measure offspring height Calculate average = Midoffspring value Plot both for each family (ii) Human height is clearly heritable in this situation b Zero (no) Heritability (i) Slope of relationship not statistically different from 0 (zero) c Intermediate Heritability (i) Slope of heritability approximately 0.5 (not a very strong correlation) d High Heritability (i) Slope statistically different from 0 (zero) with a value near 1 (one) 2) Phenotypic variation (V P ): a The total variation in a trait among individuals in a population or sample 3) Genetic variation (V G ): a Variation among individuals due to variation in their genes 4) Environmental variation (V E ): a

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