Which of the following does not occur during meiosis?
1. Pairing of homologous chromosomes
2. Exchange of segments between non sister chromatids of homologous chromosomes
3. DNA replication in interkinesis
4. Reduction in chromosome number
The figure shows a dividing cell at:
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In meiosis, DNA replication occurs:
1. Only once before Meiosis I
2. Only once before Meiosis II
3. Twice, once before meiosis I and once during interkinesis
4. Twice, once before meiosis I and once during anaphase I of meiosis I
When a cell is preparing for mitosis, it is said to be in which phase of the cell cycle?
1. | G1 | 2. | G0 |
3. | S | 4. | G2 |
Consider the following events:
I. Centromere split and chromatids separate
II. Chromatids move to opposite poles
The stage of mitosis characterized by these two events is:
1. | Prophase | 2. | Metaphase |
3. | Anaphase | 4. | Telophase |
Cells at the end of prophase of mitosis, when viewed under the microscope, do not show:
I. Golgi complexes
II. Endoplasmic reticulum
III. Nucleolus
IV. Nuclear envelope
1. Only I and II are correct
2. Only III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Consider the following two statements:
I: | The growth of multi-cellular organisms is due to mitosis. |
II: | Mitosis results in the production of diploid daughter cells with identical genetic complement usually. |
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Identify the correct statement regarding meiosis amongst the following:
I. Meiosis involves two sequential cycles of nuclear and cell divisions but only a single cycle of DNA replication.
II. Meiosis II is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.
III. Meiosis involves pairing of bivalents and recombinations between them.
1. | I only | 2. | I and II only |
3. | I and III only | 4. | I, II and III |
The phase of mitosis in which the spindle fibers break apart, two new nuclear membranes begin to form, and the chromosomes disperse into chromatin is
1. | metaphase | 2. | telophase |
3. | anaphase | 4. | prophase |
Which of the following distinguishes the prophase I of meiosis from the prophase of mitosis?
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible