S-08-MCB140practiceMidterm

S-08-MCB140practiceMidterm - NAME STUDENT ID MCB 140 1st...

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NAME: _____________________________________ STUDENT ID #: ______________________________ MCB 140 1 st Midterm Fall 2007 NAME (Please print):__________________________________________ STUDENT ID #:_______________________________________________ REMINDERS 1. You have 120 minutes for the 150 point exam . Exams will be collected at 8.30 pm sharp. 2. Print your name and ID# on each page of the exam. You will lose points if you forget to do this. 3. There are … pages total, including this cover page. All pages must be turned in. 4. Only the front of each page will be graded. If you use the back of a page, transcribe your answer to the space provided on the front of the page. The exam is very short but the questions are “content-laden,” i.e., well- thought-out answers are expected and required for you to receive full credit (note: this does not mean “verbose” – just thoughtful). Think before you start writing about the best way to express the point you wish to make. ----------------------------------------(Do not write below this line)---------------------------------------- 2 (30) _____ 3 (30) _____ 4 (30) _____ 5 (30) _____ 6 (30) _____ TOTAL _____ / 150 Page 1 of 6
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NAME: _____________________________________ STUDENT ID #: ______________________________ Question 1 (30 points) Gregor Mendel’s immortal experiments on plant hybridization made extensive use of variations in seed color and in seed shape. For example: Parents: round seeded plants x wrinkled seeded plants F1: round-seeded x round-seeded (self-cross) F2: 3 round : 1 wrinkled On the basis of these data, Mendel deduced that discrete particles of inheritance (that we now call alleles) are carried by the F1 plants, that the particles reach a compromise for the life of the F1 plant, and then follow his 1 st law – equal segregation – to generate the F2 progeny. This was quite revolutionary – for a period of science when people believed in “blending inheritance.” Come to think of it, “seed wrinkling vs not” could be in the eye of the beholder. Surely some seeds are more sunlit when in the pod than other seeds, and then shrink a bit? Maybe the F1 seeds are just a tiny bit wrinkled (as per the “blending inheritance” model), and then all of the phenotypic distribution in the F2 could simply be the “norm of reaction” of the F2 to the amount of sun the seeds are getting (maybe seed shape exhibits sunlight-dependent variable expressivity)?
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