BIO220H1 Lecture Notes - Lecture 8: Selective Breeding, Plant Breeding, Corn Flakes
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BIO220H1 Full Course Notes
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Bio220 lecture 8 notes: ecology of ancient and modern. Quaternary period: last 2. 68 million years an ice age with alternating glacial and interglacial periods. Humans emerged at around 2 million years. Agriculture is a post glacial phenomenon in the last 10 000 years: holocene epoch: interglacial period, different in many parts of the world, came late to the americas. Different agricultural origins happened in different parts of the world storing seeds, planting, cultivating. Key evolutionary innovation: non-shattering seed heads, amylase evolution. Beans, lentils, chick peas increased proteins. Our staple foods are plants due to our primitive diet which is opportunistic and unreliable. Domestication of cattle, sheep, poultry & evolution of lactose tolerance. Human life transformed: nomadism replaced by stability, rise of cties: very sedentary culture, living one place in a city, very recent. We had many limitations on the primitive cropping system: limited areas suitable for growth plant ranges of tolerance were typically limited by temperature, water, nitrogen, p, k.
