Q. No.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
During anaphase I of meiosis
1. Homologous chromosomes separate
2. Non-homologous autosomes separate
3. Sister chromatids separate
4. Non-sister chromatids separate
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 |
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 |
A ribbon-like structure consisting of three protein components and extending across the region of synapsed chromosomes during the prophase of meiosis, is called:
| 1. | Phragmoplast | 2. | Phragmosome |
| 3. | Synaptonemal complex | 4. | Recombination nodule |
The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over is called:
| 1. | Centromere | 2. | Centrosome |
| 3. | Chiasmata | 4. | Tetrad |
The most important significance of meiosis is that:
| 1. | It increases variations in the gene pool of the species that helps in evolution of that species. |
| 2. | It causes growth in the multicellular organisms. |
| 3. | It conserves specific number of chromosomes in each species across generations. |
| 4. | It is vital for repair and regeneration functions in the living organisms. |
Consider the following statements regarding meiosis:
| I: | At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes. |
| II: | At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other. |
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
During meiosis, the bivalent chromosomes clearly appear as tetrads first at:
| 1. | Zygotene of Prophase I | 2. | Pachytene of Prophase I |
| 3. | Metaphase I | 4. | Anaphase I |
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