MCDB1A_Final_Exam_Fall2005_Christoffersen

MCDB1A_Final_Exam_Fall2005_Christoffersen - Part III...

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MCDB 1A Final Exam White 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: 68. The actual alleles present in an individual are called their: 69. Which of the following F2 phenotypic ratios would show codominance? 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?
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MCDB 1A Final Exam White page: 15 72. If you are a male, your X chromosome contains genes derived from: 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? 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
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