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Q. No.How many of the given statements are correct?
I:
F1 resembled either of the two parents in co-dominance
II:
F1 was in-between in complete dominance.
III:
F1 generation resembles both parents in incomplete dominance.
1. Only I
2. Only II and III
3. None
4. I, II and III
Subtopic: Co-dominance |
70%
From NCERT
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Regarding ABO blood group genetics:
I: Three alleles control blood type: A, B, and O.
II: A and B are codominant, while O is recessive.
III: Six genotypes and four phenotypes are possible.
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: Three alleles control blood type: A, B, and O.
II: A and B are codominant, while O is recessive.
III: Six genotypes and four phenotypes are possible.
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: Co-dominance |
78%
From NCERT
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Starch synthesis in pea seeds is controlled by one gene. What will be true?
| Statement I: | BB homozygotes produce large starch grains, Bb heterozygotes produce large starch grains and bb homozygotes produce smaller starch grains. |
| Statement II: | BB homozygotes produce round seeds, Bb heterozygotes produce oval seeds and bb homozygotes produce wrinkled seeds. |
| 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: Co-dominance |
57%
From NCERT
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The physical basis of independent assortment is:
1. Metaphase I of Meiosis I
2. Metaphase II of Meiosis II
3. Anaphase I of Meiosis I
4. Anaphase II of Meiosis II
1. Metaphase I of Meiosis I
2. Metaphase II of Meiosis II
3. Anaphase I of Meiosis I
4. Anaphase II of Meiosis II
Subtopic: Dihybrid Cross: General Consideration |
From NCERT
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The pedigree shown below, most likely, exhibits the inheritance of a/an:
1. Autosomal recessive trait
2. Autosomal dominant trait
3. X linked recessive trait
4. X linked dominant trait
1. Autosomal recessive trait
2. Autosomal dominant trait
3. X linked recessive trait
4. X linked dominant trait
Subtopic: Pedigree Analysis: Problem Solving |
53%
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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%
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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. |
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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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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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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