BIS 10 Lecture 22: 3/8/17

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Plan for today: vitamins what are they and how much should we eat, selection, evolution, and food. A vitamin is a substance that makes you ill if you don"t eat it. (albert szent-gyorgyi, nobel. Roles of vitamin a: cofactor for opsin light receptors in the eye. It is bound to the opsin protein, and it is the molecule that absorbs the light: regulates gene transcription (during development and in immune cells). Vitamin a claims: acne, vitamin a related molecules can inhibit the bacteria to spread. Agriculture: cultivation (farming) about 12,000 years ago, domestication of plants and animals (human modification), seeds with larger food reserves germinate quicker, and offer a competitive advantage, single harvest event (feeding in winter). Improvements in power, farming tools, storage, and transfer of domesticated plants and animals around the world: human modification of the environment. Continuous variation: the variation of a trait that shows up in a population.

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