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Q. No.During Mendel’s investigations into inheritance patterns, it was for the first time that:
I:
artificial hybridisation experiments were carried out.
II:
statistical analysis and mathematical logic were applied to problems in biology.
1.
Only I
2.
Only II
3.
Both I and II
4.
Neither I nor II
Subtopic: Chromosomal Basis of Inheritance: Introduction |
57%
From NCERT
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Consider the given two statements:
| Statement I: | Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. |
| Statement II: | Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Monohybrid Cross: Further Understanding |
93%
From NCERT
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In a monohybrid cross, ¼ of the random fertilisations lead to:
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
| I: | Homozygous dominant progeny |
| II: | Homozygous recessive progeny |
| III: | Heterozygous progeny |
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: Monohybrid Cross: Further Understanding |
70%
From NCERT
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Consider the given two statements:
| Assertion (A): | Mendel self-pollinated the F2 plants and found that dwarf F2 plants continued to generate dwarf plants in F3 and F4 generations. |
| Reason (R): | The genotype of the dwarfs was homozygous. |
| 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 Assertion. |
| 3. | Both (A) and (R) are False. |
| 4. | (A) is True but (R) is False. |
Subtopic: Monohybrid Cross: Further Understanding |
62%
From NCERT
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In Antirrhinum majus, how many of the given cross will produce all progeny exhibiting similar phenotypes [symbols carry usual meanings]?
1. 1
2. 2
3. 3
4. 4
| I: | \(Rr \times Rr\) | II: | \(Rr \times rr\) |
| III: | \(RR \times rr\) | IV: | \(Rr \times RR\) |
1. 1
2. 2
3. 3
4. 4
Subtopic: Monohybrid Cross: Further Understanding |
From NCERT
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Mendel published his work on inheritance of characters in 1865 but for several reasons, it remained unrecognised till 1900. These reasons included all the following except:
| 1. | Communication was not easy in those days. |
| 2. | His concept of genes (or factors, in Mendel’s words) as stable and discrete units that controlled the expression of traits and, of the pair of alleles which did not ‘blend’ with each other, was not accepted by his contemporaries as an explanation for the apparently continuous variation seen in nature. |
| 3. | Mendel’s approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time. |
| 4. | Although Mendel’s provided correct physical proof for the existence of unit factors as discrete entities, his explanations could mot convince others. |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
77%
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 |
83%
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 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%
From NCERT
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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 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: Pedigree Analysis: Problem Solving |
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 |
68%
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