HMB265H1 Lecture : Notes taken during lecture

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4 Mar 2011
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HMB265H1 Full Course Notes
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HMB265H1 Full Course Notes
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Variation in average differences in genotypes between individuals and environmental variation that gives phenotypic variation. Environmental variation because of food, climate, illnesses, etc. Discrete traits either or traits; single-gene traits. Whole-number range of values possibilities are not infinite. additive gene action in heterozygote, exactly intermediate of the two homozygotes: this occurs with additive effects. Incomplete dominance is example of additive gene action: heterozygote has trait value or state that is intermediate quantitatively between the two homozygous classes but not exactly. Intermediate: this occurs because of environmental variation. Mutations in few genes cause familial hypercolesteremia. because any one of the many genes is mutated can result in this. blurring of lines: genotypically heterozygote but phenotypically homozygous can result because of environmental influence. Broad sense extend of phenotypic variation that is attributed to genetic variation, all types of genetic variation. can be quantified by hsquared (representing broad sense)

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