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Unformatted text preview: 03:29 Why understand genetics: Identify and preserve native plants and current germplasm Genetically change plants Economics Biology Food production Aesthetics Germplasm Genetic material controls heredity and the tissues organs and organisms which express variation contained in that genetic material Gene = unit of heredity A segment of DNA that tells the cell how to make a particular protein Locus location of a gene on chromosome There are many genes on a single chromosome Genotype = expression of genes/ what they look like Who many chromosomes in a cell? Karyotype XX for female XY for male Two sets of each chromosomes in humans - diploid Plants are diploid, triploid, tetraploid and so one Gives more genetic variation Genetic Variability Potatoes not much variability Asexually reproduced Not conceived, grown from the tuber Blue potatoes, -- 250 varieties of potato in world but in Wisconsin have 10-12 varieties Peppers Hotness is a genetic variability Can make less hot Segregating Squash Thickness of seed coat varies Thinner seed coat tastes better Why are Genetic Resources important Maintenance of existing plants Introduction of new plants Modification of existing plants important to understand the genetics Increase yield Increase biofuel (mass) Increase nitrogen fixation Improve shelf life Drought resistance Pest resistance Seedless fruit / consumer proof...
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- Fall '11