CH3-1 - Chapter 3, Part I Extensions to Mendel (single-gene...

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Chapter 3, Part I Extensions to Mendel (single-gene inheritance)
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1. Dominance is not always complete - Incomplete Dominance - Co-dominance 2. Genes can have more than two alleles - - 3. One gene may contribute to multiple traits - Extensions to Mendel for single-gene inheritance
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Incomplete Dominance : the progeny have a trait in between those of the parents
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Variation occurs due to the additive effect of gene products (proteins) aa A A a a AA + A a Aa A a
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Co-Dominance : both traits are visible
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Another Example
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Summary
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Do Variations on Dominance Relations Negate Mendel’s Laws? Dominance relations affect phenotype and have no bearing on the segregation of alleles Gene products control expression of phenotypes differently Mendel’s law of segregation still applies (Alleles still segregate randomly) Interpretation of phenotype/genotype relation is more complex
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Multiple Alleles in Human Blood Type
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Mutations are the source of new alleles Novel alleles arise spontaneously in nature due to
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CH3-1 - Chapter 3, Part I Extensions to Mendel (single-gene...

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