The end of prophase is marked by the beginning of the organization of a group of fibres to form a spindle and the disintegration of the nuclear membrane. … During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form.
What happens in the prophase stage?
During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes. Chromosomes are made of a single piece of DNA that is highly organized.
Which of these occurs near the end of prophase?
The chromosomes pair up so that both copies of chromosome 1 are together, both copies of chromosome 2 are together, and so on. At the end of prophase the membrane around the nucleus in the cell dissolves away releasing the chromosomes.
What specific events happen during prophase?
The main events of prophase are: the condensation of chromosomes, the movement of the centrosomes, the formation of the mitotic spindle, and the beginning of nucleoli break down.
What happens to the chromosomes in prophase 2?
During prophase II, the chromosomes condense, and a new set of spindle fibers forms. The chromosomes begin moving toward the equator of the cell. During metaphase II, the centromeres of the paired chromatids align along the equatorial plate in both cells.
Which of the following occurs at the end of telophase?
Telophase and Cytokinesis
Mitosis ends with telophase, or the stage at which the chromosomes reach the poles. The nuclear membrane then reforms, and the chromosomes begin to decondense into their interphase conformations. Telophase is followed by cytokinesis, or the division of the cytoplasm into two daughter cells.
What happens at the end of metaphase?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. These chromosomes then become visible. During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell. … As metaphase continues, the cells partition into the two daughter cells.
Which of the following occurs at the end of metaphase?
c. a cell divides into two cells with identical genetic information. d. spindle fibers attach to the poles of the cell.
What happens in prophase and prometaphase?
In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. … In telophase, chromosomes arrive at opposite poles, and nuclear envelope material surrounds each set of chromosomes.
What stage occurs after cytokinesis?
The G1 phase is a period in the cell cycle during interphase, after cytokinesis (process whereby a single cell is divided into two identical daughter cells whenever the cytoplasm is divided) and before the S phase. For many cells, this phase is the major period of cell growth during its lifespan.
What happens to the chromosomes during telophase?
During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm. The chromosomes begin to uncoil, which makes them diffuse and less compact.
What happens during prophase 1 and prophase 2 that is not the same?
Prophase 1 is the initial phase of meiosis 1 and prophase 2 is the initial phase of meiosis 2. … The main difference between prophase 1 and 2 is that genetic recombination occurs through crossing overs and the “Chiasmata” formation during prophase 1 whereas no genetic recombination is noticed at the prophase 2.
What happens in prophase I and not in prophase II?
In prophase I, the first stage is known as leptotene. This stage involves the unwinding of the DNA structure to enable an exchange of alleles between homologous chromosome pairs. No crossing over occurs in prophase II. Therefore, prophase II does not feature leptotene.
What happens late prophase 1 meiosis?
In late prophase I, homologous chromosomes (also called bivalent chromosomes, or bivalents) pair laterally, or side-by-side. At this time they are said to be in synapsis. … Note that these bivalents have two chromosomes and four chromatids, with one chromosome originating from each parent.