Lecture 9 - Biology 313 Lecture 9 Sept 13, 2010...

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Biology 313 Lecture 9 Sept 13, 2010
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Wednesday 22 September  Bessey Room 210 @ 7 pm FREE PIZZA & POP! (for dues-paying Dr.Gwyn Beattie, Plant Pathology Department “Survival strategies and community functions of leaf-associated bacteria”
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Why are there eye color anomalies in some Drosophila crosses? Calvin Bridges (Morgan student) found “exceptional progeny” in crosses of some Dros. strains: red-eyed males and white- eyed females when it was not expected Explanation: nondisjunction (I’ll describe) These experiments provided definitive evidence that eye color genes are sex- linked and that genes reside on chromosomes (I’ll describe why) . Concept requires knowledge of sex determination in Drosophila: Bridges figured this out
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Bridges discovered sex is determined by the X: autosome ratio (X: A ratio) For simplicity: “haploid sets of autosomes” is same as ploidy level of the cell: n, 2n, etc. Sex determination in Drosophila: genic balance mechanism
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Bridge’s test of his hypothesis
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arise from nondisjunction
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This note was uploaded on 10/06/2011 for the course BIO 313 taught by Professor Rodermel during the Spring '11 term at Iowa State.

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Lecture 9 - Biology 313 Lecture 9 Sept 13, 2010...

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