MCDB1A_Final_Exam_Fall2005_Christoffersen - Part III...

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M C D B 1 A F i n a l E x a m W h i t e page: 14 Part III Genetics - Professor Christoffersen 66. Among the dihybrid crosses below, which will give a 1:1 ratio? A) AABB x aabb B) AaBb x AaBb C) AaBb x aabb D) AaBB x aaBB E) AAbb x aaBB 67. An allele that expresses its phenotype even when heterozygous with a recessive allele is termed: A) recessive B) recombinant C) dominant D) parental E) independent 68. The actual alleles present in an individual are called their: A) recombinant types B) zygote C) dominant allele D) allele E) genotype 69. Which of the following F2 phenotypic ratios would show codominance? A) 2:1 B) 3:1 C) 1:2:1 D) 1:1 E) 4:1 70. Nondisjunction can occur at either the first or second division of meiosis. XYY individuals would most likely arise from nondisjunction at the ______ meiotic division in the ______. A) first, mother B) second, mother C) first, father D) second, father E) more than one of the above could give rise to XYY individuals 71. Crossing over between homologous chromosomes occurs at which of the following stages of meiosis? A) S phase B) prophase I C) metaphase I D) anaphase I E) prophase II
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M C D B 1 A F i n a l E x a m W h i t e page: 15 72. If you are a male, your X chromosome contains genes derived from: A) your paternal grandfather only. B) your maternal grandfather only. C) both your paternal and maternal grandfathers. D) both your paternal grandfather and grandmother. E) both your maternal grandfather and grandmother. 73. Suppose the A and B genes are on the same chromosome but separated by 20 map units. What fraction of the progeny from the cross AB/ab × ab/ab would be phenotypically AB? A. 10% B. 20% C. 40% D. 80% E. 100% 74. The alleles of the I gene determine the ABO blood groups. The AB blood group is an example of a codominant interaction between the I A and I B alleles. What explanation for this codominant interaction between alleles is correct? A. The I A and I B alleles of the I gene are equally dominant over the I O allele B. The I A and I B alleles code for antibodies that can be expressed simultaneously and thus are called AB antibodies C. The I A and I B alleles code for glucosyltransferase enzymes which put different sugars on the cell surface. D. The I A and I B alleles code for proteins which show equal competitive interactions with the antibodies which generate the AB phenotype E. none of the explanations above are correct 75. How many Barr bodies would you expect to find in an XXX human female? A) 4 B) 3 C) 2 D) 1 E) 0 76. Hemophilia A is caused by a sex-linked recessive allele. If a woman has hemophilia A) her mother must also have had hemophilia. B) half of her daughters will have hemophilia. C) all of her sons will have hemophilia.
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This note was uploaded on 05/04/2008 for the course MCDB 1AL taught by Professor Bush during the Spring '07 term at UCSB.

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MCDB1A_Final_Exam_Fall2005_Christoffersen - Part III...

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