Gen371 Minitest 3 (white)

Gen371 Minitest 3 (white) - Gen371 Minitest 3 (white)...

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1/26/11 4:20 PM Gen371 Minitest 3 (white) Page 1 of 3 http://courses.washington.edu/au371mkr/resources/problems/mt3_white.html Minitest 3 19 November 2010 (white version) 1. A spontaneous, dominant mutation that causes Drosophila to have green bodies has been found. (a) To map the chromosomal location of this mutation, the cross shown below is performed. (Assume that there are no aberrant events and that no Balancer chromosomes are involved.) Identify one specific aspect of the results that rules out X-linkage of the G locus: Male offspring with green bodies Female offspring with tan bodies ...both rule out X-linkage of the G locus. Note: You are asked to show how the results of the cross lead to this conclusion; just citing the genotype that is given doesn't count. (b) To establish unambiguously whether the G locus is on the 3rd chromosome, a testcross was designed using only flies from the progeny in (a). Show the genotypes of the flies in this testcross ( including phase as appropriate) and the expected phenotype outcomes if the G locus is on the 2nd vs. the 3rd chromosome. (Reminder: Rough-eye locus is on 3rd chromosome.) Notes: It has to be a testcross (and the flies have to be the same in both
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Gen371 Minitest 3 (white) - Gen371 Minitest 3 (white)...

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