Mitosis.ppt
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Mitosis is the process of cell division where a cell splits into two identical daughter cells. It has four main phases: prophase, metaphase, anaphase, and telophase. During interphase, the cell grows and prepares for division, including replicating its DNA. In mitosis, the nuclear membrane breaks down and chromosomes condense and align before splitting into two identical sets that are separated into two new daughter nuclei, which are then partitioned into two new daughter cells during cytokinesis.
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1. Cleavage is the first phase of embryonic development after fertilization where the fertilized egg undergoes rapid, indirect cell divisions (mitosis) without an increase in overall size to form a multicellular embryo.
2. The pattern of cleavage depends on how much yolk is present in the egg. Eggs with little yolk (isolecithal) undergo total cleavage (holoblastic), while eggs with more yolk have partial cleavage (meroblastic).
3. In amphibians, which have mesoleithal eggs, cleavage is initially equal but becomes unequal with larger vegetal and smaller animal cells. This leads to the formation of a blastula with a fluid-filled cavity (
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Mitosis is the process where a cell divides into two identical daughter cells. It occurs in both plant and animal cells as part of growth and development. In plants, mitotically dividing cells are found in meristems, while in animals they are in dividing embryos and growing tissues. Mitosis maintains the same number and type of chromosomes, allowing genetic information to be identically passed to both daughter cells. It involves several phases: interphase, prophase, prometaphase, metaphase, anaphase, telophase, and cytokinesis. Cytokinesis then separates the two daughter cells through a cell plate in plants or cleavage furrow in animals.
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Cell division is the process by which a parent cell divides into two or more daughter cells. There are two main types of cell division: mitosis and meiosis. Mitosis produces two identical daughter cells during growth and repair of the body. It ensures the genetic makeup remains the same. Meiosis produces gametes with half the number of chromosomes and involves two cell divisions. It results in genetic diversity that is important for sexual reproduction.
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The document lists homework assignments and provides information about the cell cycle. It asks students to complete four assignments for homework and answer a question about the three main stages of the cell cycle and what occurs in each. The document then describes the stages of mitosis - interphase, prophase, metaphase, anaphase, and telophase - and provides brief explanations of what happens in each stage.
Cell division and dna
The document discusses the process of cell division, including the two main types (mitosis and meiosis). It explains DNA structure and replication, the stages of mitosis (prophase, metaphase, anaphase, telophase), and the cell cycle stages of interphase and the M phase. The goal of cell division is to make copies of cells for growth, tissue repair, and reproduction.
3-Cell-Cycle-Mitosis-and-Meiosis.ppt
The document summarizes the cell cycle, including the stages of interphase (G1, S, G2), mitosis, and meiosis. It explains that the cell cycle involves cell growth and DNA replication in interphase, followed by nuclear division in mitosis. Meiosis involves two nuclear divisions to produce haploid gametes from a diploid cell, reducing the chromosome number by half to maintain genetic variation between generations.
Mitosis
The document describes the four phases of mitosis: prophase, metaphase, anaphase, and telophase. During prophase, the chromosomes condense and become visible. In metaphase, the chromosomes line up in the center of the cell. Anaphase involves the separation of chromatids as they move to opposite poles. Telophase ends with the chromosomes spreading out and a nuclear envelope reforming around each group. Cytokinesis then splits the cytoplasm, with animal cells pinching inward and plant cells forming a cell plate between nuclei.
bio5.2
Cells undergo mitosis and cytokinesis to divide. During mitosis, DNA is duplicated and condensed into chromosomes. Mitosis consists of four phases - prophase, metaphase, anaphase, and telophase - where chromosomes condense, align, separate, and decondense. Cytokinesis then divides the cytoplasm, forming two daughter cells through pinching in animal cells or cell plate formation in plant cells.
Unit 9, lesson 1 cell cycle mitosis
There are two main reasons why cells need to divide instead of growing indefinitely. 1) DNA overload would occur as larger cells place more demand on DNA that is only able to meet the needs of smaller cells. 2) Larger cells have more trouble exchanging nutrients and waste due to decreased surface area to volume ratio. The cell cycle involves interphase where the cell grows and copies its DNA, followed by mitosis where the cell divides into two identical daughter cells through the stages of prophase, metaphase, anaphase and telophase. Cytokinesis then separates the cytoplasmic contents to complete cell division.
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- 9. PROPHASE
- 10. PROPHASE
- 13. METAPHASE
- 16. ANAPHASE
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