The transition period between M-phase I and M-phase II in without DNA ...
The transition period between M-phase of Meiosis I and M-phase II during which no replication of DNA occurs is called as interkinesis.
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The transition period between M-phase I and M-phase II in without DNA ...
Interkinesis is the correct answer.
Explanation:
Interkinesis is the phase between M-phase I and M-phase II of meiosis, during which there is no DNA replication. It is similar to interphase of mitosis, but with certain differences. Some of the key features of interkinesis are:
- Chromosomes decondense: After the completion of meiosis I, the chromosomes of each cell (now called secondary spermatocyte or secondary oocyte) decondense and become less visible under the microscope.
- Nuclear envelope reforms: The nuclear envelope, which had broken down during meiosis I, reforms around the chromosomes. This separates the chromatin from the cytoplasm and allows for the regulation of nuclear transport.
- No DNA replication: Unlike S-phase of interphase, there is no DNA synthesis during interkinesis. The chromosomes remain in their haploid state (having half the number of chromosomes as the original cell).
- Centrosomes duplicate: The centrosomes, which are responsible for organizing the microtubules during cell division, duplicate during interkinesis. This prepares the cell for the upcoming meiosis II, in which the microtubules will attach to the kinetochores of the chromosomes.
- No crossing over: Since the chromosomes have already undergone crossing over during meiosis I, there is no further exchange of genetic material during interkinesis. Each chromosome contains a unique combination of genes from both parents, which will be segregated during meiosis II.
Thus, interkinesis is an important phase of meiosis that allows for the separation of homologous chromosomes and the preparation for the final stages of cell division.
The transition period between M-phase I and M-phase II in without DNA ...
Interkinesis is the transition period between M-phase I and M-phase II without DNA replication. During this phase, the cell undergoes a brief interphase-like stage where there is no DNA synthesis or replication. The chromosomes still remain condensed and are attached to the spindle fibers.
Explanation:
Interkinesis is a short period of time that occurs between meiosis I and meiosis II. During meiosis I, the cell undergoes homologous recombination and chromosome segregation, resulting in two haploid daughter cells. In meiosis II, these daughter cells divide again to produce four haploid cells. However, during the interkinesis phase, the cell does not undergo DNA replication. Instead, it prepares for the second round of division by ensuring that the chromosomes are properly aligned and attached to the spindle fibers.
During interkinesis, the cell enters a state similar to interphase, where it carries out normal cellular functions like protein synthesis and metabolism. However, the chromosomes remain condensed and attached to the spindle fibers, which allows them to quickly undergo division when meiosis II begins.
Overall, interkinesis is an important period that allows cells to prepare for the second round of division without duplicating their DNA. This ensures that the resulting haploid cells have the correct number of chromosomes and are genetically diverse.