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Q. No.Consider the given two statements:
Assertion (A):
In Grasshoppers, the males have an odd number and females have an even number of chromosomes.
Reason (R):
Males develop parthenogenetically in Grasshoppers.
1.
Both (A) and (R) are True and (R) is the correct explanation of (A).
2.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.
(A) is True but (R) is False.
4.
(A) is False but (R) is True.
Subtopic: Sex Determination |
75%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | If a couple have a female child from the first pregnancy, they will have a male child from the next pregnancy. |
| Reason (R): | In each pregnancy, there is always 50 per cent probability of either a male or a female child. |
| 1. | (A) is False but (R) is True. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
Subtopic: Sex Determination |
82%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Pedigree analysis is used for the analysis of inheritance of genetic traits in human families. |
| Reason (R): | Choice matings are not possible in humans and the number of progeny are also limited, usually. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Pedigree Analysis: Basics |
Level 3: 35%-60%
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Consider the given two statements:
| Assertion (A): | The son of a woman who carries the gene for colour blindness has a 50 percent chance of being colour blind. |
| Reason (R): | Colour blindness is inherited as an autosomal recessive condition in humans. |
| 1. | (A) is False but (R) is True |
| 2. | (A) is True but (R) is False |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: Pedigree Analysis: Basics |
75%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | Regarding Down's syndrome, parents of the affected individual are usually genetically normal. |
| Reason (R): | The probability increases from low in 20-year-old mothers to higher in those of age 45. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 4. | (A) is False but (R) is True |
Subtopic: Mendelian Disorders |
Level 3: 35%-60%
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During Mendel’s investigations into inheritance patterns, it was for the first time that:
| I: | artificial hybridisation experiments were carried out. |
| II: | statistical analysis and mathematical logic were applied to problems in biology. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
57%
Level 3: 35%-60%
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Consider the given two statements:
| Statement I: | Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. |
| Statement II: | Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Monohybrid Cross: Further Understanding |
93%
Level 1: 80%+
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In a monohybrid cross, ¼ of the random fertilisations lead to:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Homozygous dominant progeny |
| II: | Homozygous recessive progeny |
| III: | Heterozygous progeny |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Monohybrid Cross: Further Understanding |
71%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | Mendel self-pollinated the F2 plants and found that dwarf F2 plants continued to generate dwarf plants in F3 and F4 generations. |
| Reason (R): | The genotype of the dwarfs was homozygous. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains Assertion. |
| 3. | Both (A) and (R) are False. |
| 4. | (A) is True but (R) is False. |
Subtopic: Monohybrid Cross: Further Understanding |
63%
Level 2: 60%+
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In Antirrhinum majus, how many of the given cross will produce all progeny exhibiting similar phenotypes [symbols carry usual meanings]?
1. 1
2. 2
3. 3
4. 4
| I: | \(Rr \times Rr\) | II: | \(Rr \times rr\) |
| III: | \(RR \times rr\) | IV: | \(Rr \times RR\) |
1. 1
2. 2
3. 3
4. 4
Subtopic: Monohybrid Cross: Further Understanding |
Level 3: 35%-60%
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