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- Most plants exhibit alternation of generations, which is described as haplodiplontic: the haploid multicellular form known as a gametophyte is followed in the development sequence by a multicellular diploid organism, the sporophyte. The gametophyte gives rise to the gametes, or reproductive cells, by mitosis.
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Mitosis is cell division which produces two identical diploid cells for growth and repair. Differentiation occurs when cells become specialised. Stem cells can develop into different...
- The Challenges of Size in Animals
Cell models It's straightforward to model cells using cubes....
- The Challenges of Size in Animals
The gametophyte gives rise to the gametes, or reproductive cells, by mitosis. It can be the most obvious phase of the life cycle of the plant, as in the mosses, or it can occur in a microscopic structure, such as a pollen grain in the higher plants (the collective term for the vascular plants).
Oct 21, 2024 · Mitosis is a process of cell duplication, in which one cell divides into two genetically identical daughter cells. In the various stages of mitosis, the cell’s chromosomes are copied and then distributed equally between the two new nuclei of the daughter cells.
- The Editors of Encyclopaedia Britannica
- Mitosis is the division of a cell into two daughter cells that are genetically identical to the parent cell. Meiosis is the division of a germ cell...
- Mitosis is important to multicellular organisms because it provides new cells for growth and for replacement of worn-out cells, such as skin cells....
- Interphase
- Mitotic Division
- Cytokinesis
It is the preparatory growth phase of mitosis when the DNA (the genetic material) gets copied. It is the most active phase of the cell cycleinvolving a series of metabolic changes. Interphase has three stages: G1-phase: The first growth phase of the cell cycle, it is the resting stage during which some cell organellesincrease in size, and the cells...
1. Prophase
It is the first and the longest of all phases of mitosis. Prophase shows the following distinct changes within the cell: 1. The beginning is marked by the appearance of thin thread-like condensing X-shaped chromosomes. 2. Each chromosome is made of two coiled filaments called sister chromatids. 3. As the stage progresses, the sister chromatids become increasingly shorter and thicker that join together at a site called the centromere. 4. The two pairs of centrioles, formed during interphase, m...
2. Metaphase
1. It is the second phase of mitosis and is marked with the complete disappearance of the nuclear envelope that had started during prophase. 2. The chromosomes, which are at their shortest and thickest stage with two sister chromatids, get attached to the spindle fibers present at the opposite poles. 3. They then align end to end along the middle of the cell. 4. The spindle fibers then attach to each of the sister chromatids.
3. Anaphase
1. It starts by splitting each paired chromosome into two sister chromatids, now known as daughter chromosomes. 2. The daughter chromosomes are pulled towards the opposite end of the cell due to the contraction of the spindle fibers. 3. At the end of this phase, each pole contains a complete set of chromosomes.
This is the process where the cytoplasm gets divided to produce two independent daughter cells, each containing a complete set of chromosomes. Cytokinesis begins at the anaphase stage and continues through telophase and into the interphase. In the end, mitosis results in two genetically identical daughter cells, each having diploid (2n) number of c...
The gametophyte gives rise to the gametes, or reproductive cells, by mitosis. It can be the most obvious phase of the life cycle of the plant, as in the mosses, or it can occur in a microscopic structure, such as a pollen grain in the higher plants (the collective term for the vascular plants).
Mar 1, 2001 · The mitotic cell cycle consists of alternating rounds of DNA replication (which occurs during the S phase) and chromosome segregation (mitosis or M phase) interrupted by gaps known as G1 (the interval before S phase) and G2 (the interval after S phase).
Mitosis is generally followed by a process called cytokinesis, during which the cytoplasmic components of the daughter cells are separated either by an actin ring (animal cells) or by cell plate formation (plant cells). Passage through these phases is controlled by checkpoints.
