MCB164 MT2 S05KEY

MCB164 MT2 S05KEY - Name_KEY_ MCB164 Spring 2005 Page 1 of...

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Name________KEY_______________________ MCB164 Spring 2005 Page of 6 1 ID #________________________________ SECOND MIDTERM MAY 16, 2005 Question Points Score 1 8 2 12 3 8 4 14 5 12 6 20 7 16 8 10 Total 100 v This examination is closed book. v There are 6 pages to the exam. Please count them before you start to make sure all are present . v Please write your name on each page of the exam . v Answer each question in the space provided. If additional space is required use the back of the page and indicate clearly that you continued your answer on the back. Do not attach additional pages. v GOOD LUCK! Student authorization: I authorize the instructor to return the graded exam to me in the main office or to distribute it in the bin for me to pick up. Signature _____________________________ Date_____________________
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Name________KEY_______________________ MCB164 Spring 2005 Page of 6 2 1. (8 points) Mark the following statements as being either T (True) or F (False). ___T/F___ A yeast spore arising from a MI PSSC event (precocious separation of sister- chromatids) would contain one of each of the parentally-derived chromosomes. ___F___Cohesins form a ladder-like structure between sister chromatids within a bivalent while the synaptonemal complex forms a ring-like structure that encircle the bivalent. ___T___Fertilization of a mouse oocyte by a sperm occurs prior to the second meiotic chromosome division. ___T___ Cohesins linking the centromeric regions of chromosomes are released at anaphase II of meiosis. 2. (12 points) Fill in the blanks of the partially composed letter below using vocabulary words covered during this part of the course. Try to be as explicit as possible in your usage (i.e I vs. II) Dear Mom, First of all, thanks for the check I really appreciate it. I have been taking this really interesting course in genetics. You wouldn’t believe what chromosomes can do. Did you know that during meiosis more than 200 DOUBLE-STRAND BREAKS are introduced into our chromosomes before they go on to make gametes? These are repaired by a mechanism called homologous recombination. Usually a NON-SISTER chromatid is used as a substrate for repair. Sometimes there is a nonreciprocal exchange of genetic information, which is also known as GENE CONVERSION . These events are often associated with
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MCB164 MT2 S05KEY - Name_KEY_ MCB164 Spring 2005 Page 1 of...

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