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Q. No.Turner’s Syndrome:
I:
is an aneuploidy
II:
causes infertility in affected females
III:
does not affect the development of secondary sexual characters in affected females
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
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: Sex Aneuploidy - Turner & Klinefelter Syndrome |
82%
From NCERT
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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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