Class 10 - Trihybrid crosses Alfred Sturtevant fly phishing...

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Unformatted text preview: Trihybrid crosses Alfred Sturtevant fly phishing Exam Monday 6:30-8:30PM Place: Right here, A2B70 MCDB Bring ID, #2 Pencil, calculator You need to know your student #. Friday will be a review class - please email to krauter@colorado.edu questions you would like answered Additional review 3-5PM Monday Sept 22 in MCDB A120 2 So to get the order.... Look at all of the outcomes Find those that come from a double cross over event (must be the lowest frequency class - could be zero!) Identify the one allele that differs with the parents in that class 3 4 Which of these is a DCO (double cross over)? A) st e ss B) st + e ss C) st e ss + D) st e + ss 278 283 3 5 43 41 50 52 4 Which of these is a DCO (double cross over)? A) st e ss B) st + e ss C) st e ss + D) st e + ss 278 283 3 5 43 41 50 52 5 So what is the gene order in this example? A) st - e - ss B) st - ss - e C) e - st - ss D) e - ss - st 278 283 3 5 43 41 50 52 5 So what is the gene order in this example? A) st - e - ss B) st - ss - e C) e - st - ss D) e - ss - st 278 283 3 5 43 41 50 52 since parental is st + e + ss + and one double crossover is st e + ss + the st allele is changed on this chromosome, so it must be the middle marker Gene order From above we know gene order because: Parentals wer e st + e + ss + a nd st e ss Doubles were st + e + ss and st e ss + So on st is varying in DCOs so its got to be in the middle so gene order is: ss st e 6 Please answer this next question without talking to your neighbor Female flies phenotypically wild-type and heterozygous for each of three different mutations [curly wings (c), short bristles (b), and sepia eyes (s)] were crossed to male flies that have curly wings, are short bristles, and have sepia eyes. The number of progeny in eight different phenotypic classes is: Which of the three genes (c,b,s) is in the middle? A.Curly B.Short Bristles C.Sepia Wild-type = 446 Sepia eyes & Curly wings= 10 Curly wings = 42 Sepia eyes & Short bristles = 40 Sepia eyes = 2 Short bristles & Curly wings = 1 Short bristles = 10 Sepia eyes, Curly Wings, & Short bristle = 449 Please talk to your neighbor and answer this question again Please talk to your neighbor and answer this question again Female flies phenotypically wild-type and heterozygous for each of...
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Class 10 - Trihybrid crosses Alfred Sturtevant fly phishing...

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