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Q. No.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: Chromosomal Basis of Inheritance: Introduction |
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The chromosomal theory of inheritance:
| I: | identifies chromosomes as the carriers of genetic material. |
| II: | was given by Sutton and Boveri. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
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In 1900, Mendel’s work was rediscovered by:
| 1. | Khorana, Nirenberg and Mathei |
| 2. | de Vries, Correns and von Tschermak |
| 3. | Avery, McCleod and McCarty |
| 4. | Watson, Crick and Wilkins |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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The two alleles of a gene pair are located on:
| 1. | The same chromosome. |
| 2. | Different chromosomes. |
| 3. | Homologous sites on homologous chromosomes. |
| 4. | Homologous sites on heterologous chromosomes. |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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“Chromosomes, which are seen in all dividing cells and pass from one generation to the next, are the basis for all genetic inheritance”.
This statement is credited to:
| 1. | Watson and Crick | 2. | Hershey and Chase |
| 3. | Sutton and Boveri | 4. | Meselson and Stahl |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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T. H. Morgan worked on the fruit fly, Drosophila melanogaster. Which of the following is not an advantage of this fly?
| 1. | They could be grown on a simple synthetic medium in the laboratory. |
| 2. | They complete their life cycle in about two years, and a single mating could produce a large number of progeny flies. |
| 3. | There was a clear differentiation of the sexes – the male and female flies are easily distinguishable. |
| 4. | It has many types of hereditary variations that can be seen with low-power microscopes. |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:
| 1. | The genes are located on the X and Y chromosomes. |
| 2. | Fruit fly has abnormal chromosomes. |
| 3. | The genes are located on the X chromosome. |
| 4. | The genes exhibit incomplete dominance. |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations | Understanding Linkage |
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Consider the given two statements:
| Assertion(A): | Behaviour of chromosomes at the time of cell division decides the behaviour of genes. |
| Reason(R): | Chromosomes are the vehicles of the genes. |
| 1. | (A) is False but (R) is True. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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