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Q. No.Consider the given two statements:
Assertion (A):
In a dissimilar situation, the chance of a gamete receiving the dominant allele of a given gene is much higher than receiving the recessive allele.
Reason (R):
Recessive alleles are always present in less number than a dominant allele in the gene pool.
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 and (R) is also False
Subtopic: Monohybrid Cross: 1 |
59%
From NCERT
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Consider the given two statements:
| Assertion (A): | Although there are three alleles for the ABO blood group types in humans, an individual is expected to carry only two of any such alleles. |
| Reason (R): | To study multiple allelism, the geneticist must study the population and not an individual. |
| 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: Polygenic Inheritance & Pleiotropy |
70%
From NCERT
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Consider the given two statements:
| Assertion (A): | Reciprocal crosses carried out on Drosophila by Morgan while taking eye colour as the trait under study did not yield same results. |
| Reason (R): | The gene for eye colour in Drosophila is a holandric [located on Y chromosome] gene. |
| 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: Chromosomal Basis of Inheritance: Introduction |
62%
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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%
From NCERT
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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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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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 |
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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%
From NCERT
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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%
From NCERT
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