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cell divison part 1~1

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cell divison part 1~1

Cell Cycle & Cell Division - Mitosis - Part 1

Mitosis takes place in somatic cells and in germinal cells during multiplication phase. It is also known as equational division as the chromosome number is same in both the daughter cells and the parent cell.

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Cell Divison Part 3~1

Cell Cycle and Genes - Mitosis & Meiosis

Cell Cycle and Genes - Mitosis & Meiosis.
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Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Meiosis is a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes.

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MEIOSIS OR REPRODUCTION DIVISION _ PART 01

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CELL CYCLE AND CELL DIVISION: MEIOSIS ORREPRODUCTIONDIVISION:Meioum means to diminish,The type of cell division, in which the chromosome number is reduced exactly to half is called meiosis. The term meiosis was coined by J.B. Farmer 1905.It occurs in reproductive cells of sexually reproducing organisms.The cells in which meiosis occurs are called meiocytes.In meiosis the chromosomes present in meiocyte is reduced to half in Meiosis- I. & these reduced chromosomes divided by mitotically in Meiosis-II. In this the mother cell divides into four daughter cells and these cells are unidentical when compared to their parent cell.Every organism has definite number of chromosomes in diploid condition 2n. All organisms begin their life form at zygotic stage. The zygote is formed by the fusion of gametes. Thus in diploid organisms every cell has 2 sets of chromosomes each acquired from the male and female gametes. Chromosomes with similar characters, uniform size & types belonging to parental sources are called homologous chromosomes. In the life cycle of diploid organisms, the chromosome number is reduced to half at one stage or the other. If not, at every fertilization the chromosome number would be doubled leading to abnormal number & causes unimaginable genetic disorders. Since the number of chromosomes is reduced to half, it is called reduction division.

Mitosis: Splitting Up is Complicated - Crash Course Biology #12

Hank describes mitosis and cytokinesis - the series of processes our cells go through to divide into two identical copies.

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Table of Contents
1. Mitosis 0:24
2. Interphase 3:27
a) Chromatin 3:37
b) Centrosomes 3:52
3) Prophase 4:14
a) Chromosomes 4:18
b) Chromatid 4:31
c) Microtubules 5:07
4) Metaphase 5:22
a) Motor Proteins 5:36
5) Biolography 6:13
6) Anaphase 9:00
7) Telophase 9:15
8) Cleavage 9:25
9) Cytokinesis 9:36

This video contains the following sounds from Freesound.org:
Swishes.wav by Pogotron
Opening Scotch Whisky.mp3 by Percy Duke

crashcourse, biology, mitosis, cell biology, cell division, cell, replication, splitting, chromosome, diploid cells, nucleus, DNA, prophase, metaphase, anaphase, telophase, interphase, chromatin, chromatid, centrosome duplication, centromere, microtubules, motor protein, walter flemming, tomomi kiyomitsu, dynein, cleavage, cytokinesis, daughter cells, science, education, college, university, learn, teach, hank green Support CrashCourse on Patreon:
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Cell Cycle & Cell Division - Cell Cycle - Part 1

Cell cycle includes preparatory phase and a division phase. The phases inter phase and M phase.

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Biology Cell Cycle & Cell Division part 1 (Why cell division) CBSE class 11 XI

Biology Cell Cycle & Cell Division part 1 (Why cell division) CBSE class 11 XI

Cell cycle phases | Cells | MCAT | Khan Academy

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8.2.1 - Cell Division, Chromosomes

Biology 122
Week8.Lecture2.Part1:
Cell Divsion, Chromosomes
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CELL CYCLE AND CELL DIVISION (EASY WAY) / NCERT/ PART 1

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CELL CYCLE AND CELL DIVISION (EASY WAY) / NCERT/ PART 1

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AIIMS / NEET 2019 - XI Biology: Cell cycle and Cell division Lecture - 1

1. The concept of Cell cycle
2. Cell cycle & its Phases
3. Interphase & M Phase
4. The need for Cell cycle
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mitosis 3d animation |Phases of mitosis|cell division

Phases of mitosis:This animation demonstrates the stages of mitosis in an animal cell.

Mitosis is the process in which a eukaryotic cell nucleus splits in two, followed by division of the parent cell into two daughter cells. The word mitosis means threads, and it refers to the threadlike appearance of chromosomes as the cell prepares to divide. Early microscopists were the first to observe these structures, and they also noted the appearance of a specialized network of microtubules during mitosis. These tubules, collectively known as the spindle, extend from structures called centrosomes — with one centrosome located at each of the opposite ends, or poles, of a cell. As mitosis progresses, the microtubules attach to the chromosomes, which have already duplicated their DNA and aligned across the center of the cell. The spindle tubules then shorten and move toward the poles of the cell. As they move, they pull the one copy of each chromosome with them to opposite poles of the cell. This process ensures that each daughter cell will contain one exact copy of the parent cell DNA.


Interphase: Cells may appear inactive during this stage, but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates, the centrioles divide, and proteins are actively produced. For a complete description of the events during Interphase, read about the Cell Cycle.

Prophase: During this first mitotic stage, the nucleolus fades and chromatin (replicated DNA and associated proteins) condenses into chromosomes. Each replicated chromosome comprises two chromatids, both with the same genetic information. Microtubules of the cytoskeleton, responsible for cell shape, motility and attachment to other cells during interphase, disassemble. And the building blocks of these microtubules are used to grow the mitotic spindle from the region of the centrosomes.

Prometaphase: In this stage the nuclear envelope breaks down so there is no longer a recognizable nucleus. Some mitotic spindle fibers elongate from the centrosomes and attach to kinetochores, protein bundles at the centromere region on the chromosomes where sister chromatids are joined. Other spindle fibers elongate but instead of attaching to chromosomes, overlap each other at the cell center.

Metaphase: Tension applied by the spindle fibers aligns all chromosomes in one plane at the center of the cell.

Anaphase: Spindle fibers shorten, the kinetochores separate, and the chromatids (daughter chromosomes) are pulled apart and begin moving to the cell poles.

Telophase: The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear.

Cytokinesis: The spindle fibers not attached to chromosomes begin breaking down until only that portion of overlap is left. It is in this region that a contractile ring cleaves the cell into two daughter cells. Microtubules then reorganize into a new cytoskeleton for the return to interphase.

CELL DIVISION / MEIOSIS (EASY WAY) / NCERT/ NEET

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CELL DIVISION / MEIOSIS (EASY WAY) / NCERT/ NEET

CELL DIVISION MITOSIS:-

CELL CYCLE:-

CELL DIVISION NUMERICALS:-

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Cell Cycle & Cell Division - Meiosis I - Prophase I - Part - 1

In prophase I of meiosis crossing over takes place which results in exchange of genetic material.

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Ch-10 Cell Cycle and Cell Division NCERT Based Explanation Full CYTOLOGY Part 1

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ICSE Class 10th Biology - Cell Cycle & Cell Division(Part 1)

Part 1 discuss about Chromosome,DNA and Genes....Watch the Video to learn about them

NEET Biology 2019 | Cell and Cell Division - Part 1

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K-hub | Cell Division Part 1: Mitosis and Cell Cycle | Grade 9 Science

K-HUB: CELL DIVISION PART 1: MITOSIS AND CELL CYCLE

LEARNING COMPETENCY: Cell Division

This episode explains the process of cell division. It involves reproduction, growth, and repair of cells. It talks discusses Mitosis and Meiosis. Mitosis is the process by which new cells are generated while meiosis is the process by which gametes are generated for reproduction.

NEET Biology || Cell Cycle & Cell Division For Class 11th , NEET & AIIMS { PART- 1} Dr. S.K.Singh

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