Wi09 Homework 5

Wi09 Homework 5 - Genetics Homework #5 – Due in lecture...

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Unformatted text preview: Genetics Homework #5 – Due in lecture Wednesday, March 11 You must include your name, your Student ID, your TA’s name, and your section number at the top of your paper. You may type or write, as long as it is neat and legible. 1. In a heterozygote for an inverted chromosome, one “normal” chromosome is °ABCDE, and the “inverted” chromosome is °ADCBE, where “°” represents the centromere. Draw the chromosomes paired during Prophase I, and diagram the consequences of crossovers between the following strands. In each case, assume that one crossover occurs between B and C, and the other crossover occurs between C and D. a. b. c. d. Two‐strand double crossover. Three‐strand double crossover (one normal homolog not included). Three‐strand double crossover (one inverted homolog not included). Four‐strand double crossover. 2. The following table shows genotypes for a number of lac operons in which the Z gene has been genetically engineered. The symbol ZGFP represents an engineered gene that encodes a green fluorescent protein; cells that produce this protein fluoresce green. The symbol ZRFP represents an engineered gene that encodes a red fluorescent protein; cells that produce this protein fluoresce red. Cells that produce neither protein do not fluoresce, and those that produce both proteins fluoresce yellow (resulting from the mixture of green and red). Complete the table by entering “green”, “red”, “yellow” or “none” corresponding to the fluorescence of cells of each genotype when grown in the absence (‐) or presence (+) or inducer. a. b. c. d. e. f. g. h. i. Genotype I+ OC ZGFP I­ O+ ZGFP IS O+ ZGFP F’ I+ OC ZRFP/I+ O+ ZGFP F’ I+ O+ ZRFP/I+ OC ZGFP F’ I­ OC ZRFP/I+ O+ ZGFP F’ I­ O+ ZRFP/I+ OC ZGFP F’ IS OC ZRFP/I+ O+ ZGFP F’ IS O+ ZRFP/I+ OC ZGFP + Inducer ­ Inducer ...
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