which of the following correctly orders events during mitosis?
The correct order of events during mitosis is as follows:
1. Interphase: The cell prepares for division by replicating its DNA and growing in size.
2. Prophase: Chromatin condenses into chromosomes, the nuclear membrane disintegrates, and spindle fibers begin to form.
3. Prometaphase: The spindle fibers fully form, and sister chromatids attach to the spindle fibers at their centromeres.
4. Metaphase: The chromosomes line up along the equator of the cell, known as the metaphase plate.
5. Anaphase: The spindle fibers contract, separating the sister chromatids and pulling them to opposite poles of the cell.
6. Telophase: The chromosomes reach the opposite poles of the cell, and a new nuclear membrane forms around each set of chromosomes.
7. Cytokinesis: The cell finally divides into two daughter cells, each containing a complete set of chromosomes.
In order to determine the correct order of events during mitosis, we need to understand the different stages of mitosis:
1. Prophase: The chromatin condenses to form visible chromosomes. The nuclear envelope starts to break down, and the mitotic spindle begins to form.
2. Prometaphase: The nuclear envelope completely disintegrates. The spindle fibers attach to the kinetochores of the chromosomes, which then move towards the metaphase plate.
3. Metaphase: The spindle fibers align the chromosomes along the equator of the cell, called the metaphase plate.
4. Anaphase: The paired chromosomes separate and move towards opposite ends of the cell. The spindle fibers shorten, pulling the sister chromatids toward opposite poles.
5. Telophase: The chromosomes arrive at the opposite poles and begin to decondense. The nuclear envelope starts to reassemble, and the spindle fibers disassemble.
6. Cytokinesis: The cell pinches in the middle, forming a cleavage furrow in animal cells or a cell plate in plant cells, resulting in the division of the cytoplasm into two daughter cells.
Therefore, the correct order of events during mitosis is:
1. Prophase
2. Prometaphase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
To correctly order events during mitosis, you need to have a basic understanding of the phases of mitosis and their sequence. Mitosis is a process of cell division that consists of several distinct phases. The correct order of events during mitosis is:
1. Prophase
2. Prometaphase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis (not technically a phase of mitosis, but it occurs immediately after)
Here is a brief explanation of each phase:
1. Prophase: The first phase of mitosis. During prophase, the chromatin (long, thin, thread-like DNA) condenses into visible chromosomes. The nuclear membrane starts to break down, and the centrosomes (structures that organize the mitotic spindle) move to opposite poles of the cell.
2. Prometaphase: This phase follows prophase. The nuclear envelope fully disintegrates, and the mitotic spindle (made up of microtubules) attaches to the centromeres of each chromosome. At this point, the chromosomes are fully condensed and ready for alignment.
3. Metaphase: During metaphase, the chromosomes align along the equator of the cell, forming a single line called the metaphase plate. This alignment ensures that each daughter cell receives the correct number of chromosomes.
4. Anaphase: Anaphase is characterized by the separation of sister chromatids. The microtubules of the mitotic spindle shorten, pulling the sister chromatids apart and towards opposite poles of the cell.
5. Telophase: Telophase marks the beginning of the end of mitosis. Two distinct nuclear envelopes start to form around the separated chromatids (which are now referred to as chromosomes). The chromosomes begin to decondense, and the mitotic spindle breaks down.
6. Cytokinesis: This is not technically a phase of mitosis, but it occurs immediately after telophase. Cytokinesis is the division of the cytoplasm, resulting in the formation of two daughter cells. In animal cells, a cleavage furrow forms, pinching the cell in half. In plant cells, a cell plate forms to separate the cytoplasm.
Knowing and understanding the sequence of events during mitosis allows you to correctly order them. It's essential to review these phases and their specific characteristics to answer questions related to mitosis accurately.