Practice Quiz for General Genetics
Chapter 9 -- Chromosome Variation

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1. If an individual is heterozygous for a paracentric inversion, we would expect a
A. 33% reduction in fertility
B. 50% reduction in fertility
C. 25% reduction in fertility
D. 66% reduction in fertility

2. A human with Turner's syndrome would represent
A. a diploid condition
B. a euploid condition
C. an aneuploid condition
D. a trisomic condition

3. A technique for identifying individual chromosomes in a cell is
A. giemsa staining
B. inversion analysis
C. S-banding
D. G-banding

4. If an individual is heterozygous for a reciprocal translocation, we would expect about a
A. 33% reduction in fertility
B. 50% reduction in fertility
C. 25% reduction in fertility
D. 66% reduction in fertility

5. Because of a translocation involving non-homologous chromosomes, a growth gene suddenly finds itself expressed at a much higher rate and the cell becomes cancerous. This activation of the growth gene is because of
A. suppression of crossing over
B. nullisomy
C. transduction
D. position effects

6. Individuals made up of cells with different numbers of chromosomes (mosaics) are most likely caused by
A. nondisjunction during mitosis
B. interference during crossing over
C. failure of a chromosome to replicate during S phase
D. nondisjunction during meiosis

7. Which of the following individuals will have the MOST trouble in producing functional gametes during meiosis?
A. triploid with 30 total chromosomes
B. tetraploid with 48 total chromosomes
C. tetraploid with 12 total chromosomes
D. diploid with 46 total chromosomes

8. The conversion of a diploid karyotype of 8 acrocentric chromosomes to a diploid karyotype of 4 metacentric chromosomes would be due to
A. polyploidy
B. deletions
C. translocations
D. centric fusions

9. A transfer of genetic material between non-homologous chromosomes is called
A. an inversion
B. a centric fusion
C. a duplication
D. a reciprocal translocation

10. Duplication of short segments of DNA are often found in the genomes of organisms. These are thought to be caused by
A. gene conversion
B. unequal crossing over
C. transversion
D. reciprocal translocation

Last updated on 24 October 2004.
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