Lec55_Prelim%204%20Review - 10 map units? # recombinants X...

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2/18/09 1 Prelim 4, 7:30 PM, Feb. 19. 2009 In the exam: no phones no calculators no mothers Suggestions: • get a good night sleep • read the entire question, even if you think you know the answer • draw it on paper • if stumped, look for the underlying principle • if stumped, start somewhere, anywhere • pace yourself • there are no “trick” questions
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2/18/09 2 If a wild-type female *(b + vg/bvg + ) and a black vestigial-winged male fruit fly (bvg/bvg) are involved in a test cross, which of the following genotypes of offspring are recombinant, and what is the expected number of recombinant individuals among 500 progeny if the map unit distance between these genes is
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Unformatted text preview: 10 map units? # recombinants X 100 = 10 map units total offspring (ie 500) so, # recombinants = 50 b + vg b + vg + bvg bvg + bvg b + vg/bvg b + vg +/ bvg bvg/bvg bvg/bvg + 25 25 *written this way (instead of b + b/vg + vg) so you know which alleles are linked. Telomeres: how do they protect? Cell divisions bad news telomerase adds nucleotides germ line (or cancer cells) somatic cell divisions Overview of DNA synthesis 2/18/09 3 60 nucleotides/sec Transcription Life cycle of an enveloped RNA virus The tryptophan ( trp ) operon in E. coli the operon is normally on, but can be turned off. This is common in anabolic pathways....
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Lec55_Prelim%204%20Review - 10 map units? # recombinants X...

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