Chapter 5: Chromosome Mapping in Eukaryotes

  1. Chromosome mapping matching exercise

  2. If two genes on the same chromosome exhibit complete linkage, what is the expected F2 phenotypic ratio from a selfed heterozygote with the genotype a+b+ / ab?
    1. 1:2:1
    2. 1:1:1:1
    3. 1:1
    4. 9:3:3:1
    5. 3:1
  3. Mitotic recombination can occur in
    1. Drosophila.
    2. maize.
    3. mice.
    4. Neurospora.
    5. humans.
  4. Genes on the same chromosome form a ________ group.
    1. linkage
    2. proband
    3. sibling
    4. crossover
    5. homology
  5. The gametes produced at right result from ________ crossover.
    1. double
    2. single
    3. undetected
    4. no
    5. reciprocal
  6. A gene scores 15 second division ascospore segregation and 35 first division segregation in Neurospora. What is the map distance in mu between the gene and the centromere?
    1. 30
    2. 60
    3. 70
    4. 15
    5. 40
          • d = ((1/2 recombinant asci) / total asci) * 100 = 7.5 / 50