Q. No.Crossing over or recombination can be defined as:
1.
exchange of segments between sister chromatids of homologous chromosomes
2.
exchange of segments between non sister chromatids of homologous chromosomes
3.
exchange of segments between sister chromatids of heterologous chromosomes
4.
exchange of segments between non sister chromatids of heterologous chromosomes
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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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Identify the stage of meiotic cell division shown in the given diagram:
| 1. | Anaphase I | 2. | Anaphase II |
| 3. | Telophase I | 4. | Telophase II |
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The beginning of diplotene is recognized by:
| I: | dissolution of the synaptonemal complex |
| II: | the tendency of recombined homologues of bivalents to separate |
| III: | tetrads becoming clearly visible |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
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Meiosis results in
1. Production of gametes
2. Reduction in the number of chromosomes
3. Introduction of variation
4. All of the above
Meiosis occurs in organism during
1. Sexual reproduction
2. Vegetative reproduction
3. Both sexual and vegetative reproduction
4. None of these above
During anaphase I of meiosis
1. Homologous chromosomes separate
2. Non-homologous autosomes separate
3. Sister chromatids separate
4. Non-sister chromatids separate
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Meiosis is characterised by
1. Reduction division
2. Equal division
3. Both reduction and equal division
4. None of these
A bivalent of meiosis- I consists of
1. Two chromatids and one centromere
2. Two chromatids and two centromeres
3. Four chromatids and two centromeres
4. Four chromatids and four centromeres
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