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Q. No.If the strength of linkage between y and w is higher than w and m [y, w and m are three linked genes located on a chromosome]:
1.
the number of recombinants between y and w will be higher than the number of recombinants between w and m.
2.
the number of recombinants between y and w will be lower than the number of recombinants between w and m.
3.
the number of recombinants between y and w will be equal to the number of recombinants between w and m.
4.
no recombinants between y and w and between w and m will be formed as they are linked.
the number of recombinants between y and w will be higher than the number of recombinants between w and m.
the number of recombinants between y and w will be lower than the number of recombinants between w and m.
the number of recombinants between y and w will be equal to the number of recombinants between w and m.
no recombinants between y and w and between w and m will be formed as they are linked.
Subtopic: Understanding Linkage |
83%
From NCERT
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Consider the two statements:
| Statement I: | The dominant phenotype can be produced only by an organism with a homozygous dominant genotype. |
| Statement II: | The results of a test cross indicate whether an individual with the dominant phenotype is heterozygous or homozygous dominant. |
| 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 incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Monohybrid Cross: Further Understanding |
71%
From NCERT
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Both parents are carriers for an autosomal recessive trait. What proportion of their progeny are expected to be affected by this disorder?
1. 0
2. ¼
3. ½
4. ¾
1. 0
2. ¼
3. ½
4. ¾
Subtopic: Pedigree Analysis: More Examples |
67%
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Identify the incorrectly matched pair:
| Organism | Mechanism of sex determination | |
| 1. | Honey bees | Haplo-diploidy |
| 2. | Grasshoppers | XX-XO female heterogamety |
| 3. | Birds | ZZ-ZW female heterogamety |
| 4. | Fruit fly | Genic balance |
Subtopic: Sex Determination: Further Considerations |
69%
From NCERT
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Consider the given two statements:
| Assertion: | Human skin colour trait is spread over a gradient rather than having distinct alternate forms. |
| Reason: | Human skin colour is a polygenic trait. |
| 1. | Both Assertion and Reason are true but the Reason does not correctly explain the Assertion. |
| 2. | Both Assertion and Reason are true and the Reason correctly explains the Assertion. |
| 3. | Assertion is false but Reason is true. |
| 4. | Assertion is true but Reason is false. |
Subtopic: Polygenic Inheritance & Pleiotropy |
68%
From NCERT
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Down’s syndrome:
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
| I: | is an aneuploidy |
| II: | is trisomy 21 |
| III: | always runs in a family |
| IV: | does not affect the life span and fertility |
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
81%
From NCERT
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When preparing genetic map using recombination data, it is assumed that 1% of crossing over equals:
1. one map unit.
2. two map units.
3. five two map units.
4. ten map units.
1. one map unit.
2. two map units.
3. five two map units.
4. ten map units.
Subtopic: Recombination & Gene Mapping |
83%
From NCERT
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Consider the given two statements:
| Assertion: | X-linked recessive disorders are always expressed in males. |
| Reason: | Males have only one X chromosome. |
| 1. | Both Assertion and Reason are true but the Reason does not correctly explain the Assertion. |
| 2. | Both Assertion and Reason are true and the Reason correctly explains the Assertion. |
| 3. | Assertion is false but Reason is true. |
| 4. | Assertion is true but Reason is false. |
Subtopic: Pedigree Analysis: Problem Solving |
From NCERT
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Consider the given two statements:
| Statement I: | The two alleles of a gene pair are located on homologous sites on homologous chromosomes. |
| Statement II: | The pairing and separation of a pair of chromosomes would lead to the segregation of a pair of factors they carried. |
| 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 incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
87%
From NCERT
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Identify the incorrectly matched pair:
| 1. | de Vries, Correns and von Tschermak | Independently rediscovered Mendel’s laws |
| 2. | Walter Sutton and Theodore Boveri | Gave chromosomal theory of inheritance |
| 3. | Sturtevant | Discovered the mechanism of sex determination in fruit flies |
| 4. | T. H. Morgan | Demonstrated that genes are carried on chromosomes |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
82%
From NCERT
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