ps2 - MIT Biology Department 7.012 Introductory Biology...

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NAME________________________________TA______________Section #______ 7.012 Problem Set 2 FRIDAY September 17, 2004 Answers to this problem set must be inserted into the box outside Problem sets will NOT be accepted late. Solutions will be posted on the web. Question 1 a) What is the molecule shown below? N N N N NH 2 O N N N NH 2 NH H N 2 N O N P - O CH 3 O N HN O O H C 2 O O O O O O - 2 O O O O P CH H C 2 O 2 O CH - O O O P P - O O O A C G T 5' 3' 3' 5' Purines Pyrimidines b) What kind of bonds are indicated by the gray lines? c) Identify the purines and pyrimidines shown. MIT Biology Department 7.012: Introductory Biology - Fall 2004 Instructors: Professor Eric Lander, Professor Robert A. Weinberg, Dr. Claudette Gardel
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Question 2 Harry studies plum tree genetics. He had a pure-breeding mutant strain of plum trees that has two unusual characteristics; the mutant tree produces figs instead of plums and there are huge spikes growing out of the branches. Harry crossed the mutant with a pure-breeding wild-type plum tree. The F 1 progeny produce figs, but have no spikes. F 0 : F 1 : a) For each pair, circle the dominant phenotype. Plums Figs Spikes No spikes b) Harry performed a backcross of an F 1 individual with an F 0 individual from the mutant strain. If there are 32 progeny trees from this cross how many trees have each of the following phenotypes?
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