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2005MT1_Key

# 2005MT1_Key - Fall 2005 BICD100 Genetics MIDTERM 1 RESULTS...

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BICD100 FA05 MT1 VERSION A KEY Question 1. (5 points) VERSION A You perform a cross between a pure breeding purple-leafed plant and a pure-breeding green-leafed plant (generation P, parental). All the progeny have green leaves (F1). You self-cross the F1 progeny and analyze 100 plants from the F2 generation. cross 1: purple-leafed X green-leafed (P) progeny: all green-leafed (F1) cross 2: self-cross F1 plants progeny: 83 green, 17 purple (F2) a) Using letters of your own choosing, state the genotypes of the two parents (P) in cross 1, using a capital letter for the dominant allele. ½ pt purple-leafed parent: aa green-leafed parent: AA b) Using the symbols chosen in (a), state all the genotypes appearing in the F1 and F2 generations, their phenotypes, and in what ratio they are expected according to Mendel. 2 pts Genotype Phenotype F1 Aa ½ pt Green ½ pt F2 1AA:2Aa:1aa 3 Green: 1 Purple 1/2 pt ½ pt
c) Use a Chi Square test to determine whether the observed data ARE CONSISTENT WITH Mendel’s predicted ratio, with a confidence of P<0.05. Show your work and put a box around the χ 2 value, the P value, and circle your yes/no answer below. 2.5 pts O E (O-E) 2 (O-E)2/E 83 75 64 0.853 17 25 64 2.56 Chi square = 3.41 Df= 2-1=1 0.05<P<0.1 Circle one: YES the data are consistent with the predicted ratio NO the data are significantly different from the predicted ratio Partial credit: ½ pt for correct df ½ pt for correct obs and exp values ½ pt fro correct chisquare value ½ pt for correct p value ½ pt for circling yes

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Question 2. (2 ½ points) VERSION A You are sent on the Mars mission to determine if Martian heredity follows the same Mendelian rules or not. If you understand how Mendel’s rules explain the segregation ratios found on Earth, you should be able to predict other ratios from other (non- Mendelian) rules.
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