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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 |
82%
From NCERT
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Consider the two statements:
| 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. |
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
Subtopic: Mendelian Disorders: Thalassemia |
82%
From NCERT
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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
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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