Chapter_15_fall_2009_class

Chapter_15_fall_2009_class - Chapter15...

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Chapter 15 Chromosomes and genetics Exam 3 – November 12 Chapters 16, 17, 12, 13, 14 will be covered in exam 3 Bring IDs and pencils Help session Wednesday Nov. 11 4:30 -5:30 pm
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Chromosomes and Genes Mendel did not have a physical mechanism to  explain inheritance   Thomas Hunt Morgan (U.S.) hypothesized genetic  information was carried by __________ Morgan tested this hypothesis using a simple genetic  model, the fruit fly
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The fruit fly (Drosophila melanogaster) as a genetic model: 2 week life cycle, 100’s of offspring 2n = 8 (3 pairs of ________, 1 pair of sex chromosomes) Easily mutagenized; genetic variants
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Morgan found a mutation in eye color Normal (wild-type) Mutant (recessive)
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X female – wild type male - mutant F2 P ½ the males had red eyes and ½ the males had  white eyes – The Females all had red eyes    Thomas H. Morgan’s fruit flies F1 All offspring have _________
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X female – mutant male – wild type P Thomas H. Morgan’s fruit flies F1 All females have red eyes and all males  have white eyes F2 Let’s work it out!
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Trait named for mutation, normal or wild type  (WT); designated with + Red-eye color allele is w + ; white is w Fly Crosses (naming alleles)
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Chapter_15_fall_2009_class - Chapter15...

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