NEET Test Series from KOTA - 10 Papers In MS WORD
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BIOXII07:EVOLUTION
346544
If the gene flow occurs by chance, it is called?
1 Genetic shift
2 Genetic drift
3 Genetic migration
4 None of them
Explanation:
Genetic drift is defined as the change in gene frequency that occurs by chance in a small population. It provides diversity to a population without any adaptations.
BIOXII07:EVOLUTION
346545
Selection will not eliminate a lethal recessive allele from a large population of diploid organisms because:
1 Gene fixation will occur in the population
2 Heterozygotes are at a selective advantage
3 The allele will have some good effects and these will become dominant
4 There will always be some heterozygote carrier for the allele
Explanation:
Heterozygotic condition is when one gene is dominant and another gene is the recessive. In such conditions lethal gene will be recessive and dominant gene will express itself. The recessive gene can be expressed in the next generation and selection cannot eliminate lethal recessive allele from large population of diploid organisms. Recessive lethals produce effect only in homozygous condition, their heterozygotes are normal.
BIOXII07:EVOLUTION
346546
In a hypothetical human population in HardyWeinberg equilibrium, the frequencies of the alleles IA, IB and i are respectively \(0.1,0.3\) and 0.6 . What percentage of the population is expected to have ' \(\mathrm{B}\) ' type blood?
1 27
2 9
3 36
4 45
Explanation:
frequency of \(I^{\mathrm{A}}=0.1\) \({{\rm{I}}^{\rm{B}}}{\rm{ = 0}}{\rm{.3}}\) \({\rm{I = 0}}{\rm{.6}}\) Percentage of population with \(\mathrm{B}\) type blood \(=\mathrm{I}^{\mathrm{B}} \mathrm{I}^{\mathrm{B}}+\mathrm{I}^{\mathrm{B}} \mathrm{I}^{6}\) \(=(0.3 \times 0.3)+(0.3 \times 0.6)\) \(=(0.09)+(0.18)\) \(=0.27\) \(=27 \%\)
BIOXII07:EVOLUTION
346547
Assertion : Hardy Weinberg principle explains the variation occurring in population and species over a number of generations Reason : Hardy Weinberg principle is applicable only when genetic drift occurs
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The relative frequencies of various kinds of genes in a large and randomly mating, sexual panmictic population tend to remain constant from generation to generation in absence of mutation, selection and gene flow. This is Hardy-Weinberg principle. It is random in gene frequency and occurs only by chance. It is nondirectional. Genetic drift can cause elimination of certain alleles or fixation of other in the population, leading to change in population of alleles in gene pool. So genetic drift must not occur to maintain equilibrium.
346544
If the gene flow occurs by chance, it is called?
1 Genetic shift
2 Genetic drift
3 Genetic migration
4 None of them
Explanation:
Genetic drift is defined as the change in gene frequency that occurs by chance in a small population. It provides diversity to a population without any adaptations.
BIOXII07:EVOLUTION
346545
Selection will not eliminate a lethal recessive allele from a large population of diploid organisms because:
1 Gene fixation will occur in the population
2 Heterozygotes are at a selective advantage
3 The allele will have some good effects and these will become dominant
4 There will always be some heterozygote carrier for the allele
Explanation:
Heterozygotic condition is when one gene is dominant and another gene is the recessive. In such conditions lethal gene will be recessive and dominant gene will express itself. The recessive gene can be expressed in the next generation and selection cannot eliminate lethal recessive allele from large population of diploid organisms. Recessive lethals produce effect only in homozygous condition, their heterozygotes are normal.
BIOXII07:EVOLUTION
346546
In a hypothetical human population in HardyWeinberg equilibrium, the frequencies of the alleles IA, IB and i are respectively \(0.1,0.3\) and 0.6 . What percentage of the population is expected to have ' \(\mathrm{B}\) ' type blood?
1 27
2 9
3 36
4 45
Explanation:
frequency of \(I^{\mathrm{A}}=0.1\) \({{\rm{I}}^{\rm{B}}}{\rm{ = 0}}{\rm{.3}}\) \({\rm{I = 0}}{\rm{.6}}\) Percentage of population with \(\mathrm{B}\) type blood \(=\mathrm{I}^{\mathrm{B}} \mathrm{I}^{\mathrm{B}}+\mathrm{I}^{\mathrm{B}} \mathrm{I}^{6}\) \(=(0.3 \times 0.3)+(0.3 \times 0.6)\) \(=(0.09)+(0.18)\) \(=0.27\) \(=27 \%\)
BIOXII07:EVOLUTION
346547
Assertion : Hardy Weinberg principle explains the variation occurring in population and species over a number of generations Reason : Hardy Weinberg principle is applicable only when genetic drift occurs
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The relative frequencies of various kinds of genes in a large and randomly mating, sexual panmictic population tend to remain constant from generation to generation in absence of mutation, selection and gene flow. This is Hardy-Weinberg principle. It is random in gene frequency and occurs only by chance. It is nondirectional. Genetic drift can cause elimination of certain alleles or fixation of other in the population, leading to change in population of alleles in gene pool. So genetic drift must not occur to maintain equilibrium.
346544
If the gene flow occurs by chance, it is called?
1 Genetic shift
2 Genetic drift
3 Genetic migration
4 None of them
Explanation:
Genetic drift is defined as the change in gene frequency that occurs by chance in a small population. It provides diversity to a population without any adaptations.
BIOXII07:EVOLUTION
346545
Selection will not eliminate a lethal recessive allele from a large population of diploid organisms because:
1 Gene fixation will occur in the population
2 Heterozygotes are at a selective advantage
3 The allele will have some good effects and these will become dominant
4 There will always be some heterozygote carrier for the allele
Explanation:
Heterozygotic condition is when one gene is dominant and another gene is the recessive. In such conditions lethal gene will be recessive and dominant gene will express itself. The recessive gene can be expressed in the next generation and selection cannot eliminate lethal recessive allele from large population of diploid organisms. Recessive lethals produce effect only in homozygous condition, their heterozygotes are normal.
BIOXII07:EVOLUTION
346546
In a hypothetical human population in HardyWeinberg equilibrium, the frequencies of the alleles IA, IB and i are respectively \(0.1,0.3\) and 0.6 . What percentage of the population is expected to have ' \(\mathrm{B}\) ' type blood?
1 27
2 9
3 36
4 45
Explanation:
frequency of \(I^{\mathrm{A}}=0.1\) \({{\rm{I}}^{\rm{B}}}{\rm{ = 0}}{\rm{.3}}\) \({\rm{I = 0}}{\rm{.6}}\) Percentage of population with \(\mathrm{B}\) type blood \(=\mathrm{I}^{\mathrm{B}} \mathrm{I}^{\mathrm{B}}+\mathrm{I}^{\mathrm{B}} \mathrm{I}^{6}\) \(=(0.3 \times 0.3)+(0.3 \times 0.6)\) \(=(0.09)+(0.18)\) \(=0.27\) \(=27 \%\)
BIOXII07:EVOLUTION
346547
Assertion : Hardy Weinberg principle explains the variation occurring in population and species over a number of generations Reason : Hardy Weinberg principle is applicable only when genetic drift occurs
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The relative frequencies of various kinds of genes in a large and randomly mating, sexual panmictic population tend to remain constant from generation to generation in absence of mutation, selection and gene flow. This is Hardy-Weinberg principle. It is random in gene frequency and occurs only by chance. It is nondirectional. Genetic drift can cause elimination of certain alleles or fixation of other in the population, leading to change in population of alleles in gene pool. So genetic drift must not occur to maintain equilibrium.
346544
If the gene flow occurs by chance, it is called?
1 Genetic shift
2 Genetic drift
3 Genetic migration
4 None of them
Explanation:
Genetic drift is defined as the change in gene frequency that occurs by chance in a small population. It provides diversity to a population without any adaptations.
BIOXII07:EVOLUTION
346545
Selection will not eliminate a lethal recessive allele from a large population of diploid organisms because:
1 Gene fixation will occur in the population
2 Heterozygotes are at a selective advantage
3 The allele will have some good effects and these will become dominant
4 There will always be some heterozygote carrier for the allele
Explanation:
Heterozygotic condition is when one gene is dominant and another gene is the recessive. In such conditions lethal gene will be recessive and dominant gene will express itself. The recessive gene can be expressed in the next generation and selection cannot eliminate lethal recessive allele from large population of diploid organisms. Recessive lethals produce effect only in homozygous condition, their heterozygotes are normal.
BIOXII07:EVOLUTION
346546
In a hypothetical human population in HardyWeinberg equilibrium, the frequencies of the alleles IA, IB and i are respectively \(0.1,0.3\) and 0.6 . What percentage of the population is expected to have ' \(\mathrm{B}\) ' type blood?
1 27
2 9
3 36
4 45
Explanation:
frequency of \(I^{\mathrm{A}}=0.1\) \({{\rm{I}}^{\rm{B}}}{\rm{ = 0}}{\rm{.3}}\) \({\rm{I = 0}}{\rm{.6}}\) Percentage of population with \(\mathrm{B}\) type blood \(=\mathrm{I}^{\mathrm{B}} \mathrm{I}^{\mathrm{B}}+\mathrm{I}^{\mathrm{B}} \mathrm{I}^{6}\) \(=(0.3 \times 0.3)+(0.3 \times 0.6)\) \(=(0.09)+(0.18)\) \(=0.27\) \(=27 \%\)
BIOXII07:EVOLUTION
346547
Assertion : Hardy Weinberg principle explains the variation occurring in population and species over a number of generations Reason : Hardy Weinberg principle is applicable only when genetic drift occurs
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The relative frequencies of various kinds of genes in a large and randomly mating, sexual panmictic population tend to remain constant from generation to generation in absence of mutation, selection and gene flow. This is Hardy-Weinberg principle. It is random in gene frequency and occurs only by chance. It is nondirectional. Genetic drift can cause elimination of certain alleles or fixation of other in the population, leading to change in population of alleles in gene pool. So genetic drift must not occur to maintain equilibrium.
