BIO220H1 Lecture Notes - Lecture 14: Effective Population Size, Genetic Drift, Mendelian Inheritance
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BIO220H1 Full Course Notes
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Major food crops of the world and center of origins. Centers of origins: plants from near east fertile crescent. Barley/beer, wheat/beer, grapes/wine, lentils, peas, olives, dates, chickpeas, flax. Most of these are domesticated from one particular area in egypt: centers of origins, vavilov, and lysenko. Idea discovered and promoted by russian scientist nikolai vavilov. Key proposal: crops originated in areas where the diversity of their wild relatives is greater. If there is more diversity, more to choose from, something useful for humans. Discovered vernalization" the induction of early flowering in biennial crops by: caused by epigenetic modification of flowering time genes, allowing plants to applying cold treatment. Remember" winter to know when it has ended to flower. Problem: vernalization is reset during meiosis, and this vernalized state cannot be transmitted across generations: during meiosis, the plant forms its own gametes, thus epigenetic marks on.
