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Q. No.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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Which of the following animals exhibit male heterogamety?
(i) Fruit fly
(ii) Fowl
(iii) Human
(iv) Honey bee
1. (i) and (iii)
2. (ii) and (iv)
3. (ii) and (iii)
4. (i) and (iv)
(i) Fruit fly
(ii) Fowl
(iii) Human
(iv) Honey bee
1. (i) and (iii)
2. (ii) and (iv)
3. (ii) and (iii)
4. (i) and (iv)
Subtopic: Sex Determination |
80%
From NCERT
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The probability of all possible genotypes of offsprings in a genetic cross can be obtained with the help of :
1. Test cross
2. Back cross
3. Punnett square
4. Linkage cross
1. Test cross
2. Back cross
3. Punnett square
4. Linkage cross
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
69%
From NCERT
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The number of different type of gametes that would be produced from a parent with genotype AABBCc is:
1. 1
2. 2
3. 3
4. 4
1. 1
2. 2
3. 3
4. 4
Subtopic: Monohybrid Cross: 1 | Dihybrid Cross Analysis |
71%
From NCERT
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| Assertion (A): | Accumulation of phenylalanine in the brain results in mental retardation in Phenylketonuria. |
| Reason (R): | The affected person lacks phenylalanine which is therefore not converted to tyrosine. |
In light of the above statements choose answer from the options given below:
| 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) are true. |
Subtopic: Mendelian Disorders |
From NCERT
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