sample questions - Genes A and C 5% recombinants Genes B...

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1. Meiosis takes place in: a) Haploid cells only b) Diploid cells only c) Haploid or diploid cells d) Somatic cells e) None of the above 2. During meiosis I: a) Homologous chromosomes align and are joined through synapsis. b) Homologous chromosomes align independently at the metaphase plate, similar to what occurs during mitosis. c) Homologous chromosomes align and are held together only at their centromeres. d) Sister chromatids separate. e) B and d 3. If a nuclear gene is described as being “single-copy” in a eukaryotic genome, how many copies of the gene are present in a somatic cell in interphase prior to S phase? a) One b) Two c) Four d) One or two e) One or more 4. Three genes show the following recombination profiles between them: Genes A and B 20% recombinants
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Unformatted text preview: Genes A and C 5% recombinants Genes B and C 15% recombinants From these recombination measurements we can best conclude that: a) The gene loci must be positioned in the chromosome as in the adjacent figure (relative to the centromere and telomeres) b) The gene loci must be positioned in the chromosome as in the adjacent figure (relative to the centromere and telomeres) c) We can surmise the relative order of the three genes, but cannot determine their position in the chromosome. 5. If a gene is haplosufficient, the behavior of a null allele in a heterozygote (wild-type/null) would be predicted to be: a) Recessive b) Dominant c) Incompletely penetrant d) Variable in expressivity e) Codominant...
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This note was uploaded on 12/17/2009 for the course BIO Genetics taught by Professor Saxena during the Spring '08 term at University of Texas.

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