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GeneticsGenetics: Multiple Choice Questions

Some questions are easier than others but I would like to double check they are right please. Would appreciate if someone could help, I need to submit this by Monday.

1. Eye color is an X-linked gene and red is dominant to white in Drosophila. If I mate a red eyes male with a white eyes female and I mate a white eyed male and a purebred red eyed female, the progeny from both crosses will be the same.
a. T b. F

2. Mary met her partner Bobby at a support group for families dealing with colorblindness. Mary and Bobby are unaffected but both have one bro who is affected. They have no knowledge of other family members. Which of the following is true?
a. There is a 100% probability that they will have an affected child
b. They might both be heterozygotes
c. Since neither one of them is affected they are not at rick of having an affected child
d. Bobby will not pass a mutatnt allele to either sons or daugters

3. Mendel did not see the phenomenon of gene linkage in his experiments because:
a. He used plants in his crosses
b. He studied alleles/genes that were far apart on the same chromo
c. He studies allels/genes that were in coupling
d. He studied alleles/genes that were dominant
e. All above

4. During this phase of cell cycle the sister chromatids are already separated
a. Meta II
b. G2 phase
c. Ana O
d. Prophase
e. Cytokinesis

5. If a chi- sq test od principle of segregation is "statistically significant" this means:
a. P-value for test is > 5%
b. Data shows a good fit to 1st principle
c. Calculated x2 statistic is < 0.05
d. Calculated x2 statistic must be smaller than critical-sq value corresponding to p=0.05
e. None

6. Genes A & B are 12 centimorgans apart. Suppose F1 is created by crossing AAbb and aaBB . If the F1 were testcrossed with a doubly recessive aabb, what % of offspring wld have recombinant phenotypes?
a. 1.2%
b. 2.4%
c. 6%
d. 12%
e. 24%

7. In a test-cross, the recombinant rate b/w genes l and b is 0.03. A third gene r had a recombination rate of 0.12 with b and a recombination rate of 0.15 with l. What is the order of the 3 genes on a chromosome?
a. l r b
b. r l b
c. r b l
d. b r l
e. cannot be determined

8. Uracil is a ______, adenosine is a ______
a. Base/nucleoside
b. Nucleotide/nucleoside
c. Nucleotide/base
d. Nucleoside/base

9. An accurate exmplanantion of pleiotrophy
a. Interaction of 2 genes to give a phenotype
b. Recombination
c. Meiosis
d. Mitosis
e. None

10. After screening a population of 3000 people for a given dominant genetic defect. 64 has the defect and 5 of these has 1 affected parent. What is the mutation frequency for this gene population?
a. 60/3000
b. 65/4000
c. 5/6000
d. 60/6000
e. none

11. compare the (wt) and mutant (mt) DNA seqs. What best describes the mutation.
wt (ATCGGATGTTA)
mt (GTCGTATGTTA)
a. Transversion/transition
b. Transition/ Transversion
c. Transition/ transition
d. Deamination/ transition
e. None

12. HOW ARE THE HFR AND F' STRAINS RELATED?
a. Hfr strain donates DNA to F- strain , converting to F' strain
b. When Hfr strain is used for transduction its called an F' strain
c. Hfr strains are converted into F' strains when the F factor and some flanking bacterial DNA exits the bacterial chromosome
d. An F' strain is a Hfr straing carrying an R plasmid
e. After DNA is transferred from Hfr strain to F- strain, the Hfr becomes a F' strain

13. How can viruses cause cancer?
a. They produce oxygen
b. Carry toxins
c. Always undergo lytic cycle
d. Can cause insertional mutagenesis
e. All of above

14. If 2 diff strains of bacteria undergo gene exchange when mixed, how wld you test for transformation?
a. Expose to strains to a virus
b. Expose to strains to DNA only
c. Repeat Griffiths exp
d. Repeat Meselson/Stahl exp
e. 2 of above

15. 1. Which of the following is true?
a. The anticodon of the tRNA and amino acid have no relationship
b. Any tRNA can be charged with any amino acid
c. tRNA binds to the codon in DNA
d. The anticodon must first get activated before charging of the tRNA
e. None of these are true

16. 2. In translation the mRNA must be activated by AMP.
a. True
b. False

17. 3. The Oc mutation in the lac operon is a recessive mutation.
a. True
b. False

18. 4. The C-value paradox means:
a. large genome-more genes
b. small genome-more genes
c. large genome-fewer genes
d. small genome-fewer genes
e. none of the above

19. Xeroderm Pigmentosum is associated with a mutant DNA repair sys
a. True
b. False

20. To be capable of transformation, bacteria must be in a physiological state called
a. Hfr
b. F+
c. F
d. F"
e. None

21. If the homozygouse recessive genotype occues with freq 0.04 in a population. What is the freq of recessive allele according to HW eq?
a. 0.2
b. 0.04
c. 0.0016
d. 0.08
e. unclear

22. An example of a missense mutation would be the insertion of a number of base/nucleotides which is not a multiple of 3
a. True
b. False

23. A mutation in a proto-oncogene is a dominant mutate
a. True
b. False

24. In a given pop of dogs, curly hair (h) recessive to wildtype straight hair (h+). The population of curly hair odgs is 50 and straight haired dogs is 150. What is the frequency of heterozygotes in the population according to HW eq
a. 50%/0.5
b. 25%/0.25
c. 75%/0.75
d. 10%/0.1
e. none

25. Tautomerization is an example of spontaneous mutation
a. True
b. False

26. Generation of AP site occurs during direct repair
a. True
b. False

27. Genetic drift is associated with large populations
a. True
b. False

28. What would one use PCR for
a. Obtain lrg qty of protein
b. Obtain lrg qty of DNA
c. Obtain lrg qty of RNA
d. 2 of above
e. none

29. Which of the following stops replication of DNA in euks?
a. End of chromosomes
b. Release factors
c. RHO protein
d. DNA ligase

30. Which of the following affects the rate of transcription of lac operon
a. CAP
b. RNA Pol III
c. Poly A Tails
d. Primase
e. None

31. The E.coli genomes codes for more genes than human genome
a. True
b. False

32. Prokarytotes rRNA genes are found in
a. Ribosomes
b. Nucleus
c. Nucleolus
d. Neucleoid
e. Cell wall

33. The nucleosome is
a. Found in nucleus
b. Composed of RNA
c. Composed of DNA and RNA
d. Found in cell way
e. None

34. Correct units of measuring DNA are ______ and ______ while units for NRA are
a. bp, nm/ bases
b. turns, nm / bp
c. S values, bases/ bp
d. A and B
e. A, B and C

35. A mutation that changes a codon from Trp into a stop codon will always be an example of
a. Framshift mutation
b. Missense mutation
c. Silent mutation
d. Neutral mutation
e. Nonsense mutation

36. How is the inducer of the lac op formed?
a. Actions of Lac Y
b. Activity of Lac A protein
c. Presence of mutant repressor protein
d. Presence of CAP
e. Activity of Lac Z protein

37. If glucose and lactose are present in the bacterial media the lac operon shld be turned on
a. True
b. False

38. The Oc mutation in the lac op is a recessive mutation
a. True
b. False

39. In Euks, transcription control is necessary because
a. Diff genes are present in diff cell types
b. Diff genes are transcribed in diff cell types
c. All genes are transcribe in all cell types
d. 2 of above
e. none

40. C-paradox means
a. Large genome- fewer genes
b. Small genome- fewer genes
c. Large genome- more genes
d. Small genome- more genes

Solution Preview

Genetics- Multiple Choice questions
Some questions are easier than others but I would like to double check they are right please. Would appreciate if someone could help, I need to submit this by Monday.
1. Eye color is an X-linked gene and red is dominant to white in Drosophila. If I mate a red eyes male with a white eyes female and I mate a white eyed male and a purebred red eyed female, the progeny from both crosses will be the same.
a. T b. F
False,
Cross 1 : XR Y x X r X r
Progenies: 50% red female: 50% white male from Punnet square
Cross 2: XrY X XRXR
Progenies: All red

2. Mary met her partner Bobby at a support group for families dealing with colorblindness. Mary and Bobby are unaffected but both have one bro who is affected. They have no knowledge of other family members. Which of the following is true?
a. There is a 100% probability that they will have an affected child
b. They might both be heterozygotes
c. Since neither one of them is affected they are not at rick of having an affected child
d. Bobby will not pass a mutatnt allele to either sons or daughters
Since Bobby genotype is XY and he is normal and not a carrier, he will never pass the colorblind allele to his son or daughter.

3. Mendel did not see the phenomenon of gene linkage in his experiments because:
a. He used plants in his crosses
b. He studied alleles/genes that were far apart on the same chromo
c. He studies allels/genes that were in coupling
d. He studied alleles/genes that were dominant
e. All above
Ans: b. He studied alleles/genes that were far apart on the same chromosome. Mendel studied genes on the same chromosome that were located more than -60 cM apart. These distances is considered too far for gene linkage to occur.

4. During this phase of cell cycle the sister chromatids are already separated
a. Meta II
b. G2 phase
c. Ana O
d. Prophase
e. Cytokinesis
e. Anaphase is when sister chromatid separate to opposite pole and cytokinesis is when cell divide after sister chromatid separate.

5. If a chi- sq test od principle of segregation is "statistically significant" this means:

a. P-value for test is > 5%
b. Data shows a good fit to 1st principle
c. Calculated x2 statistic is < 0.05
d. Calculated x2 statistic must be smaller than critical-sq value corresponding to p=0.05
e. None
d. if the chi-sq test is statistically significant, this means that the x2 statistic must be smaller than the critical sq value corresponding to p= 0.05.

6. Genes A & B are 12 centimorgans apart. Suppose F1 is created by crossing AAbb and aaBB . If the ...

Solution Summary

Genetics is the study of gene inheritance, gene interaction, gene regulation, and how the phenotype gives rise to genotypes. In forward genetics, a mutation or phenotype is known and geneticists try to figure out its genotype. In reverse genetics, a DNA sequence is known and geneticist are figuring out what is the phenotype. This solution gives answers to various questions involving genetics.

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