2-26 notes - 2/26/09 Genetics & Gene Expression cont....

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2/26/09 Genetics & Gene Expression cont. B. Males- XXY causes Klinefelter Syndrom Other Possibilities: XXX- female, XXYY Heterosis (hybrid vigor)- Farmers grow AB hybrid (ex.-corn) & sells seeds - 1AA:2AB:1BB ratio of the type of plants the hybrid seeds will produce - Why don’t developing countries grow more hybrid crops? Because they often lack these inputs: - Many crops are only self-pollinated & hybrids can’t be made on a large field scale (only by hand) - Many hybrids aren’t as “hardy” as native lines that are selected over many years under poor conditions - Most hybrids need optimum inputs to reach potential **They don’t have money to buy new hybrid seed every year - GMO (genetic modification): has been going on since people began selecting plants and animals for food and other uses **Cereal-first crop actually domesticated -> “tame”&”domesticated” -domesticated: only occurs if a physical change takes place in the organism - “fertile crescent” of the middle east-where first domesticated
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2-26 notes - 2/26/09 Genetics & Gene Expression cont....

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