Q. No.Which stage of meiosis is shown in the diagram given below?
1.
Metaphase I
2.
Metaphase II
3.
Anaphase I
4.
Anaphase II
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In meiosis:
| 1. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced twice |
| 2. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced twice and DNA content getting reduced once |
| 3. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced once and DNA content getting reduced twice |
| 4. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced once |
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The mechanisms that contribute to the genetic variation arising from sexual reproduction include:
| I: | Independent assortment of chromosomes |
| II: | Crossing over |
| III: | Random fertilization |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
A prolonged resting phase in oogenesis as seen in many vertebrate oocytes is called as:
| 1. Interkinesis | 2. Diakinesis |
| 3. Diplotene | 4. Prometaphase II |
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Place stages of Prophase I in correct order.
1. diakinesis, diplotene, leptotene, pachytene, zygotene.
2. diplotene, leptotene, pachytene, zygotene, diakinesis.
3. leptotene, pachytene, diakinesis, diplotene, zygotene.
4. leptotene, zygotene, pachytene, diplotene, diakinesis
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Identify the human cell for which the interphase period lasts the entire life of a person.
| 1. | Hepatocyte | 2. | Bone marrow stem cells |
| 3. | Epidermal cell | 4. | Neuron |
Consider the following functions:
| I: | Replication of DNA along with the synthesis of nuclear proteins such as histones |
| II: | Duplication of centriole |
| III: | Synthesis of energy rich compounds and proteins |
Which of the above functions are carried out by a plant cell before it divides?
| 1. | I only | 2. | I, and II |
| 3. | I and III | 4. | I, II and III |
The duration of which of the following is constant in most cell types?
1. G1 phase, S phase and G2 phase
2. S phase, M phase and G1 phase
3. S phase, G2 phase and M phase
4. G1 phase, M phase and G2 phase
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