Genetics Quiz 3
Genetics Quiz #3
61. Unpredictable, chance fluctuation in allele frequency that has a neutral effect on fitness is called:
- A) founder effect.
- B) selection.
- C) genetic drift.
- D) mutation.
- E) inbreeding.
Also, Check Helpful Quiz
62. The process in which rare alleles increase in frequency in a new population is known as:
- A) gene flow.
- B) genetic drift.
- C) founder effect.
- D) inbreeding.
- E) selection.
63. Diseases persist because:
- A) changes in allele frequency tend toward evolutionary equilibrium.
- B) mutation balances selection.
- C) the alleles become dominant.
- D) only a and b.
- E) a, b, and c.
64. The factors contributing to the antibiotic resistance of bacterial pathogens are:
- A) patient noncompliance with drug treatments.
- B) strong selection imposed by antibiotics increases the rate of evolution in each generation.
- C) plasmids provide a means for the genetic exchange of resistance genes.
- D) only b and c.
- E) a, b and c.
65. Development of Insulin-dependent diabetes is associated with how many separate regions of the human genome?
- A) 12
- B) 10
- C) 8
- D) 6
- E) 4
66. Multifactorial traits:
- A) are affected by both genetic and environmental factors.
- B) are continuous.
- C) vary over a continuous range of measurements.
- D) are affected by environmental factors such as penetrance and expressivity.
- E) all of the above.
67. The total phenotype variance (VP) is:
- A) the sum of genetic variance (VG) and environmental variance (VE).
- B) the difference between VG and VE.
- C) not dependent on VG.
- D) not dependent on VE.
- E) always constant.
68. Heritability is defined as:
- A) VG.
- B) VP.
- C) VE.
- D) VG/VP.
- E) VP/VG.
69. The total genetic relatedness of two siblings is:
- A) 2.
- B) 1.
- C) 0.5.
- D) 0.2.
- E) none of the above.
70. Which of the following is not true about monozygotic twins.
- A) They share all alleles at all loci.
- B) They have a genetic relatedness of 0.5.
- C) They have a genetic relatedness of 1.
- D) They come from the joining of a single egg with a single sperm cell.
- E) They are the result of a split of the zygote after fertilization.
71. Recent heritability studies on twins show that there is a genetic component to:
- A) memory.
- B) extroversion.
- C) verbal reasoning.
- D) a, b, and c.
- E) only a and b.
73. The response to selection, R, is equal to:
- A) the heritability (h2) of a trait.
- B) the strength (S) of selection.
- C) the difference between h2 and S.
- D) S/h2
- .E) h2S.
74. A number of interacting genes produce quantitative inheritance. The transmission of these genes can be seen in the phenotypical pattern of:
- A) discontinuous distribution of discrete phenotypes.
- B) continuous variation in phenotypic expression.
- C) strict dominance and recessiveness.
- D) all of the above.
- E) only a and b.
75. A cross between a tall and a short pea plant produced intermediate height in the F1 generation. When the F1s were crossed plants of the original parental heights and plants with a range of heights in between the extremes were produced. The mode of inheritance is described as:
- A) multifactorial.
- B) independent assortment.
- C) incomplete dominance.
- D) codominance.
- E) segregation.
76. Multifactorial inheritance is observed in phenotypes which show typically:
- A) only one discrete type.
- B) two extremes.
- C) a bell-shaped distribution.
- D) a higher mutation rate.
- E) all of the above.
77. Continuous traits are:
- A) due to sex-linked genes only.
- B) due to autosomal genes only.
- C) qualitative in nature.
- D) quantifiable in measurements.
- E) result of test-crosses only.
78. In addition to genetic factors, environmental factors influence the inheritance of:
- A) metabolic diseases.
- B) recessive diseases.
- C) dominant diseases.
- D) sex-linked diseases.
- E) polygenic traits.
79. Brown insects living in a dark background survived in a ratio of 90/120, while the same insects in a lighter background survived in a ratio of 30/120. The ratio of relative fitness of the in sectsin dark to lighter background is:
- A) 1 : 0.333.
- B) 0.75 : 0.25.
- C) 90 : 120.
- D) 3: 1.
- E) none of the above.
80. If the relative fitness of genotypes MM, MN, NN are 0.8, 1.0, and 0.2 respectively, the expected equilibrium frequency of N is:
- A) 0.8.
- B) 1.0.
- C) 0.2.
- D) 1.25.
- E) 4.0.
Also, Check Helpful Quiz
81. Twins made from two individual zygotes (dizygotic twins):
- A) are related genetically as the monozygotic twins.
- B) share 0% genetic similarities.
- C) are similar in 100% of genetic sequences.
- D) are related genetically as non-twin siblings.
- E) is similar to parents.
82. An increase in fitness is described as:
- A) migrating to a new environment.
- B) successful adaptation.
- C) being successful in producing many offspring.
- D) exhibiting new traits.
- E) mutating to a dominant trait.
83. The frequencies of ABO blood groups in a certain population are: A=0.22, B=0.44, AB=0.18, and O=0.16. The frequency of the O allele in the population is:
- A) 0.469.
- B) 0.663.
- C) 0.424.
- D) 1.0.
- E) 0.4.
84. Under special circumstances, migration does not change allele frequencies. If the allele frequencies of a dominant and recessive allele are both 0.5, then migration of which of the following will not change the frequencies of the alleles?
- A) homozygous recessive individuals
- B) haploid individuals
- C) diploid individuals
- D) heterozygous individuals
- E) homozygous dominant individuals
Also, Check Helpful Quiz