That the pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried is the argument that formed the basis for:
1. the Law of Independent Assortment.
2. the Concept of Linkage
3. the chromosomal theory of inheritance.
4. the One Gene One Enzyme hypothesis.
Subtopic: Â Chromosomal Basis of Inheritance: Introduction |
 52%
From NCERT
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Consider the two statements:
| Statement I: | The fruit fly is a popular choice as a model organism in genetics. |
| Statement II: | It has a very long generation time and low fecundity (females lay only a few eggs in life time). |
| 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: Â Chromosomal Basis of Inheritance: Further Considerations |
 92%
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When the two genes in a dihybrid cross were situated on the same chromosome:
| 1. | the proportion of parental gene combinations were much lower than the non-parental type. |
| 2. | the proportion of parental gene combinations were much higher than the non-parental type. |
| 3. | the proportion of parental gene combinations were equal to the non-parental type. |
| 4. | only the parental gene combinations were seen in the progeny. |
Subtopic: Â Linkage |
 88%
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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: Â Dihybrid Cross Analysis |
 72%
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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: Â Conclusion |
 53%
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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: Â Polygenic Inheritance & Pleiotropy |
 92%
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: Â Polygenic Inheritance & Pleiotropy |
 91%
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: Â 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: Â Sex Determination: Further Considerations |
 55%
From NCERT
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Consider the given two statements:
1. Both Assertion and Reason are true and Reason correctly explains Assertion
2. Both Assertion and Reason are true but Reason does not correctly explain Assertion
3. Assertion is true but Reason is false
4. Assertion is false but Reason is true
| Assertion: | A sex linked recessive disorders is expected to be more common in males than in females. |
| Reason: | Males are hemizygous for sex chromosomes. |
2. Both Assertion and Reason are true but Reason does not correctly explain Assertion
3. Assertion is true but Reason is false
4. Assertion is false but Reason is true
Subtopic: Â Sex Linked Recessive Inheritance |
 73%
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