Mendel, in his garden in the 1880s
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Between Friday and today we covered the chapter on Mendelian genetics.
We discussed how Mendel performed the experiments with pea plants that led him to propose his principles of segregation and independent assortment, laying the foundation of the field of genetics.
We then discussed the apparent deviations from Mendel's principles that are observed in organisms with complex phenotypes. The genes responsible for such phenotypes do, indeed, follow Mendelian principles, but the phenotypic proportions are different from those Mendel observed. The cases we discussed were:
- Incomplete dominance
- Codominance
- Multiple alleles
- Gene interactions (including epistasis)
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