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Lecture 15

BGYB51H3 Lecture 15 Notes Oct 29


Department
Biological Sciences
Course Code
BIOC51H3
Professor
Maydianne Andrade
Lecture
15

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BGYB51H3 Lecture 15 Notes
-population genetics focuses on qualitative traits in which phenotypes fall into discrete
categories
-population genetics assumes that these discrete phenotypes are determined by genotypes and
not affected by the environment
-internal and external environment is important for the development of most traits
-other proteins can affect the expression of the phenotype
-biotic and abiotic factors affect phenotype
-phenotypes of individuals vary even when genotypes are the same
-rearing clones of plants with known genotypes in different environments produces different
phenotypes
-quantitative traits are characteristics for which phenotypes show continuous variation
-quantitative traits are determined by the environment and many genes
-quantitative traits focus on phenotypes and heritability as well as statistical properties of
population traits
-typical distribution of quantitative traits is normal distribution
-quantitative genetics involves measuring heritability, different lifetime reproductive success
and predicts effect of selection on phenotypes
-population level measures the fraction of the variation in a trait that is due to variation in
genes
-the greater the relative effect of genes on a trait, the stronger the evolutionary response
-the greater the relative effect of the environment on a trait, the weaker the evolutionary
response
-strong environment effect produces no evolutionary change
-variation in genes is affected by additive genetic variation and dominance genetic variation
-dominance genetic variation involves differences in dominance effects of genes
-additive genetic variation involves differences in the additive effects of genes
-heritability depends on additive genetic variation
-additive genetic variation can predict how offspring will turn out in terms of reproduction and
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-narrow sense heritability (h2) is an equation to predict the response of selection and the
fraction of total variation in a trait that is due to additive genetic variation
-to measure heritability, must control environmental effects
-in parent t offspring regression, similarities may be due to similar environments and genes
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