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Q. No.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 |
54%
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 |
70%
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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 |
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 |
83%
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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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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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
1. showing phenotypic plasticity
2. polygenic
3. pleiotropic
4. polymorphic
Subtopic: Polygenic Inheritance & Pleiotropy |
90%
From NCERT
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Consider the given 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: | Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment. |
| Statement II: | In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
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: Polygenic Inheritance & Pleiotropy |
90%
From NCERT
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The number of offspring genotypes and phenotypes are expected in a trihybrid cross between parents heterozygous for all three traits, assuming independent assortment and complete dominance?
1. 64 genotypes; 16 phenotypes
2. 16 genotypes; 64 phenotypes
3. 8 genotypes; 27 phenotypes
4. 27 genotypes; 8 phenotypes
1. 64 genotypes; 16 phenotypes
2. 16 genotypes; 64 phenotypes
3. 8 genotypes; 27 phenotypes
4. 27 genotypes; 8 phenotypes
Subtopic: Conclusion |
53%
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Regarding the law of independent assortment:
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: | Because of independent assortment and dominance, the 9:3:3:1 dihybrid phenotypic ratio can be collapsed into two 3:1 ratios, characteristic of any monohybrid cross that follows a dominant and recessive pattern. |
| Statement II: | The law of independent assortment also indicates that a cross between yellow, wrinkled (YYrr) and green, round (yyRR) parents would yield the same F1 and F2 offspring as in the YYRR x yyrr cross. |
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: Dihybrid Cross Analysis |
72%
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