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BIO305 Final Exam (Genetics)
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MCQs on various topics in genetics, focusing on DNA, genes, and chromosomes. Topics include: crosses, mitosis and meiosis, protein synthesis, linkage, chromosome mapping, anomalies and disorders, and genetics technology and tools.
 

 

BIO305 Final Exam (Genetics)
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25 Questions

1. Fill in the blanks. _________ are circular extrachromosomal DNA molecules that are present in varying numbers in the cell, and they can be entirely lost without changing species identity. _____DNA is usually linear, and it determines species identity.
2. Which of the following statements regarding crossing over is true?
3. A man has blood type A, his wife has blood type B, and their daughter has blood type O. The husband files for divorce on the grounds of infidelity, believing that this may not be his biological daughter. Can genetics provide evidence supporting the man's case? Why, or why not?
4. You are given the following information on genetic distances between paired genes under study. A and B are 22 cM apart; A and C are 12 cM apart; A and D are 5.9 cM apart; and D and C are 6.1 cM apart. If you use this information to construct a genetic map, what is the order of genes on this chromosome?
5. Complete the following sentence. Barr bodies, found in mammalian females, are interpreted as inactivated:
6. Complete the following sentence. Most prokaryotes reproduce asexually and are:
7. Huntington's disease is a late onset dominant disorder. Joe Doe's father has Huntington's; no one has Huntington's disease on the mother's side of Joe's family. Use a Punnett Square to predict the probability that Joe inherited Huntington's from his father.
8. You are a geneticist who uses Neurospora to study recombination, and you observe the following spore color patterns. Note that Ascus is the package that the spores were formed in. What do you conclude from this diagram?
9. Complete the following sentence. Microsatellites – otherwise known as simple sequence tandem repeats (SSTRs) – are generally di-, tri-, or tetranucleotides. Microsatellites are useful as genetic markers, because:
10. DNA microarrays are used to do which of the following?
11. Identify the analytical technique, which is illustrated on the figure.
12. Complete the following sentence. Crossing over cannot increase genetic variety if:
13. Grasshoppers have 23 homologous chromosome pairs. Assuming that no crossing over takes place, how many genetically different gametes can potentially be made by a grasshopper?
14. The following image outlines the transposition of mobile elements. Which of the following accurately identifies the names of mobile elements in boxes A and B?
15. Complete the following sentence. The following pedigree chart shows that the trait under examination would be:
16. Jane Doe and Joe Doe both have normal color vision, but their young daughter, Sue, has red-green color blindness. Joe wants a divorce, because he believes that he is not the biological father of Sue, but Jane is in denial. Can a simple Punnet Square provide supporting evidence for Jane or Joe? Why, or why not?
17. What are the genotypes of A, B, and C individuals in the following family pedigree? Use F for the dominant alleles and f for the recessive alleles.
18. What fraction of the offspring will express at least two recessive traits, if a pea plant that is heterozygous for the flower color (purple is dominant and white is recessive), for the seed color (yellow is dominant and green is recessive) and for the pod color (green is dominant and yellow is recessive) is self-pollinating?
19. Complete the following sentence. Barbara McClintock performed experiments using maize (corn) with different phenotypes of kernel color. She found that the phenotypic effect of one element (Ds) depended on the presence of another element (Ac). However, she had problems mapping these elements onto the chromosomes, because:
20. The organization of the nuclear genome is not randomized. Recent genome studies have revealed general patterns between organisms. Which of the following is NOT a domain that was noticed?
21. Which of the following is not used to experimentally manipulate gene expression in bacteria?
22. Certain species of bacteria always have the ability to utilize lactose as a carbon source. These species can do this with the help of which of the following?
23. The image below shows gene expression regulation in bacteria. Which of the following statements best describes this process?
24. Complete the following sentence. Genes within the chloroplast, mitochondria, and nucleus can be transferred back and forth between the organellar and nuclear genomes. Researchers know this, because:
25. Complete the following sentence. Gene transfer in bacteria is unidirectional, with DNA moving from the donor cell to the recipient cell. Most of the time the donor only gives a part of the DNA, making a:

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