Genetics Final Exam

100 Questions | By ProfGentle | Updated: Mar 22, 2022 | Attempts: 4229

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You might wonder why it’s so important to analyze the small, seemingly insignificant details of a person’s genetic make-up. But what you might not realize is that some things about ourselves can’t be seen by the naked eye – like a person’s chances of developing a terminal illness as a result of it being passed down from parent to offspring. What can you tell us about genetics?

Questions and Answers

1.

In a pea plant that is heterozygous for seed color, what proportion of gametes will carry the recessive allele?
- A.
  
  1/4
- B.
  
  1/2
- C.
  
  1/3
- D.
  
  All of the gametes
- E.
  
  None of the gametes
2.

A(n) gene masks the expression of a different, nonallelic gene.
- A.
  
  Imcompletely dominant
- B.
  
  Epistatic
- C.
  
  Recessive
- D.
  
  Codominant
- E.
  
  Hemizygous
3.

The genetic material of eukaryotic cells is duplicated during which stage of cell cycle?
- A.
  
  M
- B.
  
  S
- C.
  
  G1
- D.
  
  G2
- E.
  
  None of the above
4.

The appearance of traits expressed by genes in association with environmental influence is referred to as the organism's
- A.
  
  Genome
- B.
  
  Karyotype
- C.
  
  Phenotype
- D.
  
  Genotype
- E.
  
  Prototype
5.

A man with blood type A and a woman with blood type B could never produce a child with blood type
- A.
  
  A
- B.
  
  B
- C.
  
  AB
- D.
  
  O
- E.
  
  None of the above
6.

In an interacting gene pair, the gene whose expression is masked by another gene is the gene.
- A.
  
  Epistatic
- B.
  
  Homostatic
- C.
  
  Hypostatic
- D.
  
  Hyperstatic
- E.
  
  Limnostatic
7.

In human males, genes on the X chromosome are
- A.
  
  Homozygous
- B.
  
  Heterozygous
- C.
  
  Homogametic
- D.
  
  Heterogametic
- E.
  
  Hemizygous
8.

A Barr body is an
- A.
  
  Active X chromosome
- B.
  
  Inactive Y chromosome
- C.
  
  Inactive X chromosome
- D.
  
  Active Y chromosome
9.

The basic structure of nucleotide includes the following components
- A.
  
  Amino acids
- B.
  
  Base, sugar, phosphate
- C.
  
  Tryptophan and leucine
- D.
  
  MRNA, rRNA, tRNA
- E.
  
  Phosphorus and sulfur
10.

Bacterial Recombination requires?
- A.
  
  F pilus
- B.
  
  Plasmid
- C.
  
  Physical contact
- D.
  
  All of the above
- E.
  
  None of the above
11.

The two major components of Tobacco Mosaic Virus are?
- A.
  
  DNA and RNA
- B.
  
  RNA and Protein
- C.
  
  DNA and Protein
- D.
  
  Lipids and nucleic acids
- E.
  
  Carbohydrates and nucleic acids
12.

Which of the following enzymes initiate chain synthesis on a template during replication?
- A.
  
  DNA pol I
- B.
  
  DNA pol II
- C.
  
  DNA pol III
- D.
  
  RNA pol II
- E.
  
  Primase
13.

Assume that a cross is made between tall and dwarf tobacco plants. The F1 generation showed intermediate height, while the F2 generation showed a distribution of height ranging from tall to dwarf, like the original parents, and many heights between the extremes. These data are consistent with the following mode of inheritance:
- A.
  
  Multiple-factor inheritance
- B.
  
  Alternation of generations
- C.
  
  Codominance
- D.
  
  Incomplete dominance
- E.
  
  Hemizygosity
14.

Given the sequence 5’-AGTTACCTGA-3’ what would be the sequence of the complementary DNA strand?
- A.
  
  5’-TCAATGGACT-3’
- B.
  
  3’-AGTTACCTGA-5’
- C.
  
  5’-AGTTACCTGA-3’
- D.
  
  3’-TCAGGTAACT-5’
- E.
  
  5’-TCAGGTAACT-3’
15.

If the percentage of uracil in a double-stranded RNA molecule is 30%, the percentage of cytosine is?
- A.
  
  20%
- B.
  
  10%
- C.
  
  30%
- D.
  
  60%
- E.
  
  40%
16.

In a double-stranded RNA molecule of 10,000 base pairs, the approximate number of complete turns is?
- A.
  
  3000
- B.
  
  15,000
- C.
  
  1000
- D.
  
  300
- E.
  
  30
17.

Hershey and Chase differentiated between DNA and protein by:
- A.
  
  Labeling the DNA with 14Carbon, proteins with 3Hydrogen
- B.
  
  Labeling the DNA with 35Sulfur, proteins with 32Phosphorous
- C.
  
  Labeling the DNA with cesium, proteins with chloride
- D.
  
  Labeling the DNA with 32Phosphorous, proteins with 35Sulfur
- E.
  
  All of the above
18.

What is the name for the statistical measure used to describe sample variability
- A.
  
  Mean
- B.
  
  Standard Error
- C.
  
  Variance
- D.
  
  Median
- E.
  
  Covariance
19.

For a species with a diploid number of 18 chromosomes, how many chromosomes will be present in the somatic nuclei of individuals that are tetraploid?
- A.
  
  9
- B.
  
  27
- C.
  
  36
- D.
  
  18
- E.
  
  72
20.

________ results when chromatids fail to separate and move to opposite poles during anaphase.
- A.
  
  Nondisjunction
- B.
  
  Transposition
- C.
  
  Translocation
- D.
  
  Duplication
- E.
  
  Segregation
21.

The recombination frequency between three genes can be used to calculate
- A.
  
  Actual distance between genes
- B.
  
  Gene order
- C.
  
  Number of tetrads
- D.
  
  All of the above
- E.
  
  None of the above
22.

The phenomenon of crossovers in nearby regions is called
- A.
  
  Chiasma
- B.
  
  Negative Interference
- C.
  
  Reciprocal genetic exchange
- D.
  
  Positive Interference
- E.
  
  Mitotic recombination
23.

The mating system in E.coli is known as?
- A.
  
  Lysogeny
- B.
  
  Lysis
- C.
  
  Conjugation
- D.
  
  Integration
- E.
  
  Transduction
24.

The transfer of bacterial genes from one cell to another requires?
- A.
  
  F factor
- B.
  
  F plasmids
- C.
  
  F + cell
- D.
  
  All of the above
- E.
  
  None of the above
25.

Which of the following is a nonhistone protein found in chromatin?
- A.
  
  H1
- B.
  
  HMG
- C.
  
  H2A
- D.
  
  H3