Biol 202-classnotes9-20-07

Biol 202-classnotes9-20-07 - Biol 202- Genetics- 9/20/07 -...

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Biol 202- Genetics- 9/20/07 - how do genes behave during meiosis? --start simply 2 chromosomes, with 1 gene each (the genes have 2 alleles) In MI homologs separate (independent assortment) In MII sister chromatids separate in this simple case, all possibilities for gametes are 50% in this case, genes on different chromosomes have a 50% chance of assorting with each other (independent assort of genes that aren’t linked and on different chromosomes) The case is not always this simple - study w/ model organisms for genetic inheritance Model organisms? 1) make mutations easily (by UV, X-ray, chemicals, etc)(ex. flies or fungi) 2) need a phenotype so u know that uve made a mutation 3) need organisms to mate easily diploids – have 2 copies of every gene ur interested in for male flies – YX sex chromosomes for males Morgan discovered phenotype = genotype for male linked inheritance? Wild type = red eye = w+ Mutant = white eye = w Wild type = normal wing = m+ Mutant = mini wings = m So Morgan test crossed… female w/ white eyes/normal wings X male with red eyes/mini wings
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Biol 202-classnotes9-20-07 - Biol 202- Genetics- 9/20/07 -...

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