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Q. No.When a single gene can exhibit multiple phenotypic expression, the gene is said to be:
1. showing phenotypic plasticity
2. polygenic
3. pleiotropic
4. polymorphic
Subtopic: Polygenic Inheritance & Pleiotropy |
90%
From NCERT
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Males have one X and one Y chromosome in:
I: Humans
II: Grasshoppers
III: Birds
IV: Fruit fly
1. Only I and II
2. Only I and IV
3. Only II and III
4. Only II and IV
I: Humans
II: Grasshoppers
III: Birds
IV: Fruit fly
1. Only I and II
2. Only I and IV
3. Only II and III
4. Only II and IV
Subtopic: Pedigree Analysis: Basics |
85%
From NCERT
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Consider the given two statements:
| Assertion (A): | Male honeybees do not have father and thus cannot have sons, but have a grandfather and can have grandsons. |
| Reason (R): | Male honeybees produce sperms by mitosis. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Sex Determination: Further Considerations |
55%
From NCERT
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Consider the given two statements:
| Assertion (A): | A sex linked recessive disorders is expected to be more common in males than in females. |
| Reason (R): | Males are hemizygous for sex chromosomes. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Sex Linked Recessive Inheritance |
72%
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What is not true regarding Phenylketonuria?
| 1. | It is an inborn error of metabolism. |
| 2. | It is inherited as an autosomal recessive trait. |
| 3. | The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine. |
| 4. | Accumulation of phenylpyruvic acid in brain results in mental retardation. |
Subtopic: Mendelian Disorders |
83%
From NCERT
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Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Thalassemia is a qualitative problem of synthesising an incorrectly functioning globin. |
| Statement II: | Sickle cell anaemia is a quantitative problem of synthesising too few globin molecules. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Mendelian Disorders: Thalassemia |
83%
From NCERT
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Turner’s Syndrome:
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: | is an aneuploidy |
| II: | causes infertility in affected females |
| III: | does not affect the development of secondary sexual characters in affected females |
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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The cause of Klinefelter's syndrome in humans is :
1. Absence of Y-chromosome
2. Absence of X-chromosome
3. Extra copy of an autosome
4. Extra copy of an X-chromosome
1. Absence of Y-chromosome
2. Absence of X-chromosome
3. Extra copy of an autosome
4. Extra copy of an X-chromosome
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
79%
From NCERT
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Select the incorrect pair :
| 1. | Polygenic inheritance | Haemophilia |
| 2. | Linkage | Drosophila |
| 3. | Incomplete dominance | Antirrhinum |
| 4. | Pleiotropy | Phenylketonuria |
Subtopic: Polygenic Inheritance & Pleiotropy | Chromosomal Basis of Inheritance: Introduction | Linkage | Mendelian Disorders: Hemophilia |
81%
From NCERT
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According to Mendel, the nature of the unit factors that control the expression of traits were :
1. Stable
2. Blending
3. Stable and discrete
4. Discrete
1. Stable
2. Blending
3. Stable and discrete
4. Discrete
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
86%
From NCERT
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