2011Probset11key

2011Probset11key - Category Function A gene in this...

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NAME ___________________________ BIOLOGY 205/SECTION 7 DEVELOPMENT- Liljegren Problem set 11 1.) Answer the questions that follow, given the following cell lineage diagrams: a.) Draw a circle around the sixth cell division and a triangle around the first cell division to take place in the wild-type lineage. If more than one cell division takes place at the same time for either of these cell divisions, draw a second circle or triangle, respectively. b.) How many total differentiated cells will be present from the wild-type lineage shown in an adult worm? ___ 7 ___ What about for the mutant #2 lineage? ___ 6 _______ 2.) We discussed how the fly body plan is specified by a cascade of factors. Describe the function of each of the following general categories of factors, and name ONE actual gene in that category selected from the following list. treetrunk huckleberry ultrabithorax holy grail even-skipped knirps sex drive reduced nanos headless sparrow odd-skipped engrailed
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Unformatted text preview: Category Function A gene in this category a. Maternal effect _ establish the anterior/posterior axis __ ___ nanos _______ b. Pair rule _ form more refined segments _ even-skipped or odd-skipped __ c. Segment polarity _ Define ant/post regions of segment _ engrailed _______ d. Homeotic __ Specify segment identity _____ __ ultrabithorax _______ 3.) The Antennapedia gene is one of the master regulators of segment identity; it is normally expressed only in the second thoracic segment. In a fly with a loss-of-function mutation in Antennapedia, what happens? (Circle one) a. Development proceeds normally. b. The legs of the second thoracic segment are transformed into antennae. c. The third thoracic segment is transformed into a second thoracic segment. d. The legs of the third thoracic segment are transformed into antennae. e. The antennae of the head are transformed into legs. wildtype mutant #1 mutant #2...
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This note was uploaded on 05/26/2011 for the course BIO 205 taught by Professor Reed during the Spring '11 term at UNC.

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