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Q. No.Down’s syndrome:
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 |
83%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Human skin colour trait is spread over a gradient rather than having distinct alternate forms. |
| Reason (R): | Human skin colour is a polygenic trait. |
| 1. | Both (A) and (R) are True but the (R) does not correctly explain the (A). |
| 2. | Both (A) and (R) are True and the (R) correctly explains the (A). |
| 3. | (A) is False but (R) is True. |
| 4. | (A) is True but (R) is False. |
Subtopic: Polygenic Inheritance & Pleiotropy |
67%
Level 2: 60%+
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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 |
67%
Level 2: 60%+
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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%
Level 2: 60%+
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Hints
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 |
74%
Level 2: 60%+
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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.
|
Subtopic: Understanding Linkage |
84%
Level 1: 80%+
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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%
Level 1: 80%+
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Hints
Consider the given two statements:
| Assertion (A): | X-linked recessive disorders are always expressed in males. |
| Reason (R): | Males have only one X chromosome. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | (A) is False but (R) is True. |
| 4. | (A) is True but (R) is False. |
Subtopic: Pedigree Analysis: Problem Solving |
Level 3: 35%-60%
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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 incorrect
4. Statement I is incorrect; Statement II is correct
| 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 |
88%
Level 1: 80%+
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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%
Level 1: 80%+
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