BIO 200 Lecture Notes - Lecture 5: Blending Inheritance, Punnett Square, Dihybrid Cross
26 Sep 2016
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Extending mendel: do peas make it too easy, gene linkage, polygenic inheritance, epistasis, pleiotropy. Incomplete dominance and codominance: environmental effect on gene expression, epistasis. Traits from parents were blended to create an intermediate form between looks of mother and looks of father. Problem: if looks of all parents were blended into offspring in every generation, over time all organisms in the same species will look the same over time. Get a lot of data from them vary fast: true blending. True breeding plants are plants that when reproduced, all offspring will look like parents. Purple plants should give rise to purple plants. Although there were some pea plants that were white, mendel made sure that when he bred 2 purple pea plants, all offspring were purple true breeding: what does it mean to cross something. Breeding an organism with a true trait with another organism of the same specie with another true trait.
