What happens in Interkinesis stage?
During interkinesis, the single spindle of the first meiotic division disassembles and the microtubules reassemble into two new spindles for the second meiotic division. Interkinesis follows telophase I; however, many plants skip telophase I and interkinesis, going immediately into prophase II.
What happens to the nucleus during meiosis?
In meiosis, there are two rounds of nuclear division resulting in four nuclei and usually four daughter cells, each with half the number of chromosomes as the parent cell. The first separates homologs, and the second—like mitosis—separates chromatids into individual chromosomes.
What is the significance of Interkinesis?
Meiosis is a specialized form of cell division that ultimately gives rise to non-identical sex cells. There are two successive nuclear divisions: meiosis I and meiosis II.
Does the nucleus divide twice in meiosis?
Explanation: Diploid eukaryotic cell enters in meiosis, divides twice to form haploid daughter cells, also called gametes. Meiosis is thus divided in meiosis I and meiosis II. Each meiotic division is divided in prophase, metaphase, anaphase and telophase.
How is interkinesis different from interphase?
Interphase is the period that occurs before meiosis and mitosis, where the DNA replication takes place. Interkinesis is the period between telophase I and prophase II. It is a period of rest for the cells before they undergo meiosis II. No DNA replication occur during this period.
What would happen if DNA replication occurs during interkinesis?
During this stage, the DNA is replicated which leads to the production of chromosomes which consists of two sister chromatids. There will be no DNA replication in this stage. -During interkinesis, in the second meiotic division, the spindle reassembles which were disassembled during the first meiotic division.
What processes occur in the nucleus?
Two of the major activities that take place in the nucleus are: DNA replication (the synthesis of new DNA in preparation for cell division) and transcription (the production of RNA copies of parts of the DNA sequence). The production of a messenger RNA (mRNA) is the first step in the synthesis of proteins.
What happens to the nucleus during cell division?
A unique feature of the nucleus is that it disassembles and re-forms each time most cells divide. At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm.
Why does the nucleus divide twice in meiosis?
From Amy: Q1 = Cells undergoing mitosis just divide once because they are forming two new genetically identical cells where as in meiosis cells require two sets of divisions because they need to make the cell a haploid cell which only has half of the total number of chromosomes.
What does a bivalent consists of?
A bivalent consist of four chromatids and two centromeres. Bivalent is a pair of homologous chromosome lying together in the zygotene stage of prophase I of first meiotic division.