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15 Oct 07 - Quantitative Traits Mendel worked with discrete...

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Quantitative Traits Mendel worked with discrete traits . Traits that are not discrete but instead fall into a continuum are called quantitative traits .
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Frequencies in a population for a quantitative trait usually form a bell- shaped curve ( normal distribution )
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If you have Type O blood, which of the following could NOT possibly be your parents’ blood types? A. Type A mother and Type B father B. Type O mother and Type B father C. Type AB mother and Type O father D. Type O mother and Type A father E. All of the parent pairs could produce a child with Type O blood.
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Quantitative traits are produced by the actions of many genes . In polygenic inheritance , each gene adds a small amount to the value of the phenotype.
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Pleiotropy A gene that influences many traits rather than just one is pleiotropic .
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Example of pleiotropy: Marfan syndrome in humans. Research suggests that just a single gene is involved . Traits affected in a single individual: increased height long limbs and fingers abnormally shaped chest severe heart problems
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Multiple Alleles and Polymorphic Traits Some genes have more than two alleles , a situation known as multiple allelism .
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More than Two Alleles More than Two Phenotypes When different combinations of alleles produce more than two distinct phenotypes, the trait is polymorphic .
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