mid1key - 1 BIS 101 - 003 MIDTERM I January 30, 2009 READ...

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1 BIS 101 - 003 MIDTERM I January 30, 2009 READ THE FOLLOWING INSTRUCTIONS: Write your name legibly on each page of this exam. All work must be done in ink . Show all your work. Points will be subtracted for incorrect answers in multiple-choice questions. However, you will not get a negative total score for such a question. This exam is worth 100 points. You have 50 min. to complete the exam. Authorization for public distribution of graded examination I, ____________________________________, authorize the University to publicly distribute my graded examination for BIS 101-003. Date_______________________________ Signed: _____________________________ Good Luck!
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2 Name:______________________________ ID _________________________ P a g e : 3 ________ 4 ________ 5 ________ 6 ________ 7 ________ 8 ________ 9 ________ Total ________
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3 Name:_____________________________ (1) Two pure lines of laboratory rats, A 1 A 1 and A 2 A 2 , differing in body weight were crossed. The two pure lines did not differ in any other gene pair affecting body weight. The mean body weight in the heavy body weight line was 50 g (genotype A 1 A 1 ) and that in the light body weight line was 30 g (genotype A 2 A 2 ). The mean body weight of the F 1 heterozygotes A 1 A 2 was 45 g. (i) The dominance relationship between the A 1 and A 2 alleles is: (a) complete dominance of A 1 over A 2 (b) complete dominance of A 2 over A 1 (c) incomplete dominance of A 1 over A 2 (d) incomplete dominance of A 2 over A 1 (f) overdominance (g) codominance Circle the correct answer (4 points) (ii) What would the relationship between A 1 and A 2 be if the F 1 heterozygote would be 68 g? (2 points) Overdominance (2) Three alleles control the A, B, and O blood groups in humans. Write down the alleles and all possible genotypes. Assign phenotypes to the genotypes. (4 points) Alleles are: I A , I B , i Genotypes I A I A and I A i Phenotype: A Genotypes I B I B and I B i Phenotype: B Genotype I A I B Phenotype AB Genotypes ii Phenotype: O (b) Write down the dominance relationships among the three alleles. (4 points) Alleles I A and I B are completely dominant over allele i Alleles I A and I B are codominant relative to each other.
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4 Name:_____________________________ (1) A plant has two chromosome pairs: one long and one short. The diagram below represents anaphases of mitosis or meiosis of this plant genetically AaBb , the Aa gene pair being on the long chromosomes and the Bb gene pair on the short chromosomes. The
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mid1key - 1 BIS 101 - 003 MIDTERM I January 30, 2009 READ...

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