Table of Contents
- 1 What phase do spindle fibers pull chromosomes to opposite sides?
- 2 During which phase do the spindle Fibres appear and move to the opposite sides of the cell?
- 3 What are the steps of metaphase?
- 4 What happens during g1 phase?
- 5 What happens to chromosomes during prophase of mitosis?
- 6 Where do chromosomes go after they leave the nuclear membrane?
What phase do spindle fibers pull chromosomes to opposite sides?
anaphase I
After the pairs of chromosomes are aligned, anaphase I begins. During this stage, the microtubules, or spindle fibers, pull the homologous chromosomes apart and move them to opposite ends of the cell.
During which phase do the spindle Fibres appear and move to the opposite sides of the cell?
anaphase
The cell goes through an important checkpoint to ensure that all of the chromosomes are attached to the spindle and ready to be divided before it proceeds with division. Next, during anaphase, the chromosomes are simultaneously separated and pulled by the spindle to opposite poles of the cell.
What phase do chromosomes move from the center along the spindle fibers?
Two separate classes of movements occur during anaphase. During the first part of anaphase, the kinetochore microtubules shorten, and the chromosomes move toward the spindle poles.
How do spindle fibers move chromosomes?
Spindle fibers move chromosomes during cell division by attaching to chromosome arms and centromeres. A centromere is the specific region of a chromosome where duplicates are linked. Identical, joined copies of a single chromosome are known as sister chromatids.
What are the steps of metaphase?
Metaphase. Chromosomes line up at the metaphase plate, under tension from the mitotic spindle. The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide.
What happens during g1 phase?
During G1 phase, the cell grows in size and synthesizes mRNA and protein that are required for DNA synthesis. Once the required proteins and growth are complete, the cell enters the next phase of the cell cycle, S phase. The duration of each phase, including the G1 phase, is different in many different types of cells.
When do chromosomes move to opposite ends of the cell?
The replicated chromosomes are moving to opposite ends of the cell. Spindle fibers (microtubules) are visible. In anaphase, the paired chromosomes (sister chromatids) separate and begin moving to opposite ends (poles) of the cell. Spindle fibers not connected to chromatids lengthen and elongate the cell.
What happens to the daughter chromosomes during telophase?
The daughter chromosomes migrate centromere first and the kinetochore fibers become shorter as the chromosomes near a pole. In preparation for telophase, the two cell poles also move further apart during the course of anaphase. At the end of anaphase, each pole contains a complete compilation of chromosomes.
What happens to chromosomes during prophase of mitosis?
This onion root tip plant cell is in early prophase of mitosis. Chromosomes, a nucleolus, and remnants of a nuclear membrane are visible. In prophase, the chromatin condenses into discrete chromosomes. The nuclear envelope breaks down and spindles form at opposite poles of the cell.
Where do chromosomes go after they leave the nuclear membrane?
The nuclear membrane disappears completely. Polar fibers (microtubules that make up the spindle fibers) continue to extend from the poles to the center of the cell. Chromosomes move randomly until they attach (at their kinetochores) to polar fibers from both sides of their centromeres.