ISB 202 10-14-08 - ISB 202 Genetics and Gene expression o o...

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ISB 202 10-14-08 Genetics and Gene expression o Natural selection has occurred for millions of years and still happens o Over the last 10000 years people have used artificial selection to choose plants and animals for specific purposes. o Inbreeding- not good- … o If nondisjunction occurs during meiosis, the gametes will have 1 too many, or 1 too few, chromosomes. o This can happen in the 22 regular pairs… o Down syndrome caused by having three chromosomes at the 21 pair. o Turner syndrome affects women, X0. o Klinefelter syndrome affects men caused by an extra X, is XXY o XXX would be female o Back to plant breeding and impacts on food supply. o Hybrids exhibit “heterosis” (hybrid vigor) o We removed the male parts of B o Farmer from this from the seeds of an AB hybrid o Farmer sells seed from AB plant o Should the farmer save seeds produced from the hybrid plant? o What kinds of plants will seed s of plants produce? A ratio of 1AA:2AB:1BB o This impacts the world’s food supply. How?
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ISB 202 10-14-08 - ISB 202 Genetics and Gene expression o o...

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