InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Assertion (A ) `:` Gene flow increase genetic variations. Reason (R ) `:` The random introduction of new alleles into recipient population and their removal from the donor population affects allele frequency.A. Both Assertion and Reason are true, but Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is falseD. Assertion is false, but reason is true |
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Answer» Correct Answer - A Gene flow is the movement of alleles from one population to another as a result of interbreeding between the members of two populations. The random introduction of new alleles into the recipient population and their removal from the donor population affects the allele frequency of both population and leads to increased genetic variation |
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| 52. |
The variations are of which following kinds?A. Somatic and germinalB. Continuos and discontinuosC. Meristic and substantiveD. All of above |
| Answer» Correct Answer - D | |
| 53. |
The possibilities of of hereditary and evolutionary changes are greatest in species, which are reproduced byA. fissionB. buddingC. asexual meansD. sexual means |
| Answer» Correct Answer - D | |
| 54. |
Which of the following can contribute to genetic drift?A. small population sizeB. Small population bottleneckC. The thunder effectD. All of above |
| Answer» Correct Answer - D | |
| 55. |
Genetic drift, changes in allilic frequency due to change factors, occurs in populations that are veryA. isolatedB. small in numberC. mobileD. closely adapted to local environments |
| Answer» Correct Answer - B | |
| 56. |
Which one of the following is an example of discontinuos variation in mans?A. Blood groupB. HeightC. Body massD. Intellligence |
| Answer» Correct Answer - A | |
| 57. |
The reduction in pollution after 1956 is now correlated withA. reverse evolutionB. progressive evolutionC. megaevolutionD. microevolution |
| Answer» Correct Answer - A | |
| 58. |
The most likely reason for the development of resistance against pesticides in insect damaging a crop isA. Random mutationsB. Genetic recombinationC. Direct mutationsD. Acquired heritable changes |
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Answer» Correct Answer - A The environmental stress ( as pesticides) does not cause direct changes in genome,mutation, which results in phenotypes that are better adapted to the new environment (e.g. certain pesticides) |
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| 59. |
A potential danger to a population that has been greatly reduced in number is theA. loss of genetic variabilityB. tendency towards assortativve matingC. reduced Gene flowD. Hardy-weinberg disequilibrium |
| Answer» Correct Answer - A | |
| 60. |
Assertion Genetic drift is also called Sewall Wright effect Reason Genetic drift was discovered by American geneticist Sewall WrightA. Both Assertion and Reason are true, but Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is falseD. Assertion is false, but reason is true |
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Answer» Correct Answer - A Random genetic drift or the Sewall Wright effect named after the American Geneticist, who realised its evolutionary significance may be an important mechanism in evolutionary change in small or isolated populations |
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| 61. |
Mule is an example ofA. hybrid breakdownB. hybrid sterilityC. hybrid inviabilityD. None of the above |
| Answer» Correct Answer - B | |
| 62. |
When species mate at different times of the day of year there existA. Temporal isolationB. Mechanical isolationC. Spatial isolationD. Gametic isolation |
| Answer» Correct Answer - A | |
| 63. |
A horse has a karyotype 64 chromosomes and a donkey har a karyotype of 62 chromosomes. The hybrid offspring of a horse-donkey cross is a mule, which has a 63 chromosomes. A mule is sterile because it cannot successfullyA. court both mulesB. copulate with mulesC. form gametesD. complete development of the zygote |
| Answer» Correct Answer - C | |
| 64. |
Two organisms of different species mate and produce an offspring cannot mate with its siblings, nor with the members of either parental species. This is an example ofA. hybrid infertilityB. gametic isolationC. behavioural isolationD. ecological isolation |
| Answer» Correct Answer - A | |
| 65. |
Population of khaibab squirrels on north rim of the grnd canyon do not mate with the populations on south rim. They are isolated by aA. sympatric barrierB. autopatirc barrierC. gepgraphic barrierD. genetic barrier |
| Answer» Correct Answer - C | |
| 66. |
Since in the pleistocence ice age,deserts have gradually formed in south-western united states. As the lakes and rivers of these areas shrunk into isolated springs, the fishes developed strong potential forA. introgressionB. speciationC. autopolyploidyD. allopolyploidy |
| Answer» Correct Answer - B | |
| 67. |
in allopatric speciation the initial barrier to gene flow isA. BehaviouralB. Post-zygoticC. GeographicD. Ecological |
| Answer» Correct Answer - C | |
| 68. |
In galapagos finches, adaptive radiations occurred…………. Islands, while allopatric speciation occurred…………..islands.A. within, on largeB. between,withinC. on large, no smallD. within, between |
| Answer» Correct Answer - D | |
| 69. |
Hardy-Weinberg used the binomial expression `p^2+2pq+q^2` to calculate the genotype and allele frequency of a populaiton. In this equation p is |
| Answer» Correct Answer - B | |
| 70. |
Industrial melanism as observed in peppered moth proves that theA. True black melanic forms arise by a reccuring random mutationB. Melanic form of the moth has no selective advantage either in polluted industrial area or non-polluted areaC. Melanism is a pollution generated featureD. |
| Answer» Correct Answer - A | |
| 71. |
Appearance of antibiotic-resistant bacteria is an example ofA. adaptive radiationB. transductionC. pre-existing variation the populationD. divergent evolution |
| Answer» Correct Answer - C | |
| 72. |
Evolution of life shows that life forms had a trend of moving fromA. land to waterB. dryland to wetlandC. freshwater to sea waterD. water to land |
| Answer» Correct Answer - D | |
| 73. |
When populations of a plant species are located adjacent to one another because of abrupt changes in soil condotions , they are calledA. allopolypoidB. autopolyploidC. sympatricD. parapatric |
| Answer» Correct Answer - D | |
| 74. |
Assertion Dominant alleles are selected more frequently than recessive alleles Reason Dominant alleles appear in phenotype more frequentlyA. Both Assertion and Reason are true, but Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is falseD. Assertion is false, but reason is true |
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Answer» Correct Answer - A Major changes in genotypes of arganisms arise from the mutat alleles through the gene pool. If the allele is dominant it will appear in the phenotype more frequently and be selected for or against more rapidly. If the allele is recesive and has no effect in the heterozygous state will not recessive and has no effect in the heterozygous state will not undergo selection until it appears in the homozygous state |
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| 75. |
Assertion Founder principle is associated with the genetic drift Reason Genetic drift is significant in small populationsA. Both Assertion and Reason are true, but Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is falseD. Assertion is false, but reason is true |
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Answer» Correct Answer - B Founder principle is a phenomenon associated with genetic drift. This refer, that, when a small population splits off from the parent population, it may not be truly representative, In terms of alleles, of the parent population. Some alleles may be absent and alleles. of the parent population. Some alleles may be absent and others may be disproportionally represented. Continuous breeding,within the pioneer population will produce a gene pool with allele frequencies different from that of the original parent population, Genetic drift is significant in small populations. it tends to reduce the amont of genetic variation within the population, mainly as a result of the loss of those alleles, which have low frequency |
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| 76. |
Miceoevolution can be measured by compairing observed allelic frequencies with those predicted byA. changeB. the hardy-weinberd equilibriumC. mendelian ratiosD. all known environmental factors |
| Answer» Correct Answer - B | |
| 77. |
In terms of changes in gene frequencies, founder events result inA. gradual accumulation of many small changesB. large rapid changesC. polyploidyD. hybridisation |
| Answer» Correct Answer - B | |
| 78. |
Which of the following is correct ? I. Migration is the movement of individuals from a population to another population II. Emigration is the migration of individuals out of an area III. Immigration is the migration of individuals into an area IV Gene flow cannot alter the genetic charecteristics of populationsA. I and IIB. III and IVC. I, II and IIID. II, III and IV |
| Answer» Correct Answer - C | |
| 79. |
Population of dark biston betularia increased greatly in england from 1848-1898. The selective agent causing the change wasA. tree barkB. birdsC. human beingsD. toxin from smoke |
| Answer» Correct Answer - A | |
| 80. |
Population are said to be allopathic whenA. they are physically isolated by natural barriersB. they sharing the same area, but cannot interbreedC. they live together and breed freely to produce viable offspringD. they are isolated, but often come together for breeding |
| Answer» Correct Answer - A | |
| 81. |
In the snail population described above, what is the allic frequency of B?A. 0.45B. 0.55C. 0.75D. 0.8 |
| Answer» Correct Answer - B | |
| 82. |
In a population of land snails some have dark shells and others have light shells. each morph produces 100ofrings per year, but the dark-shelled morphs live long enough to reproduce for five sessions, whereas the light-shled morphs which are easily seen by bird predators, live to reproduce for only one season. The darwinian fitness of the light-shelled morphs is |
| Answer» Correct Answer - B | |
| 83. |
In the snail population described above, 20 of snails are yellow(b/b) and 80 are black(B/Bor b/b). Of the 80 black snails 30 are homozygous and 50 are heterozygous. How many of the loci for this Gene are occupied by the B allele?A. 80B. 90C. 100D. 110 |
| Answer» Correct Answer - A | |
| 84. |
A population will not exist in Hardly-Weinberg equilbrium ifA. individual mates selectivelyB. there are no mutationC. the population is largeD. |
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Answer» Correct Answer - B Hardly-Weinberg equilibrium exists in population only when following conditions are present No mutation no gene flow ltbgt No genetic recombination Random mating occurs No natural selection pressure If the individuals in the population mate selectively, it will mutation thus shifting the Hardly-Weinberg equilibrium |
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| 85. |
Male fireflies attract mates by blinking their lights, each species does so, in a characterstic pattern recognized only by females of that species. This is an example of premating isolation byA. ecological isolationB. temporal isolationC. behavioural isolationD. mechanical isolation |
| Answer» Correct Answer - C | |