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DNA at different phases chromatin chromosome histone nucleosome
DNA at different phases Chromatin - DNA + protein - before cell division (M phase) Chromosome - condensed chromatin during cell division Sister Chromatid - each individual double helix
FYI.. Body cells (autosomes/somatic cells) have 46 chromosomes or 23 pairs – Diploid – 2n Sex cells (gametes) have 23 chromosomes – Haploid - n
M phase Mitosis (nuclear division) Cytokinesis (cytoplasmic division)
Mitosis Nuclear division Cell growth stops Produces 2 similar daughter cells (2n) Asexual reproduction 1-2 hrs only Metaphase Checkpoint
Stages of Mitosis Prophase Metaphase Anaphase Telophase Cytokinesis
Prophase Chromatin thickens into chromosomes Nuclear membrane and nucleolus disintegrates Mitotic spindle forms Centrosome pairs move to opposite ends
Chromosomes at metaphase plate Centrosomes at opposite poles Kinetochores attached to microtubules
Secrets on how chromosomes move.. CentrosomeAster Sister chromatids Metaphase Plate Kinetochores Overlapping nonkinetochore microtubules Kinetochores microtubules Centrosome Chromosomes Microtubules 0.5 µm 1 µm Figure 12.7
Secrets.. Spindle pole Kinetochore
Centromeres divide Chromatids now chromosomes Kinetochore microtubules shorten - Chromosomes separate and move Nonkinetochore microtubules lengthen End: chromosomes at 2 poles
Chromosomes arrive at opposite poles Spindle fibers disintegrate Nuclear membrane reforms & Nucleolus reappears Chromatin fibers become less tightly coiled
Cytoplasm divides Animals: cleavage furrow divides cytoplasm Plant cells: cell plate Two daughter cells
Cell pinches inward
Daughter cells 1 µm Vesicles forming cell plate Wall of patent cell Cell plate New cell wall Cell Plate Formation
Mitosis in an Animal Cell
Cleavage furrow Centrioles ANIMAL CELL
Cell plate No centrioles PLANT CELL
Result of Cell Cycle two new daughter cells – identical to the parent cell in chromosome number and chromosome type net gain of only one cell two new daughter cells will enter interphase and the cycle will continue…
Cell Cycle: M Phase Mitosis and Cytokinesis. Cell Division (M phase) Occurs in two stages – Mitosis (nuclear division) – Cytokinesis (cytoplasmic division)
Cell Division and Mitosis -Chapter 9- Honors Biology Program Mountain Pointe High School.
The Cell Cycle. Chromosomes Carry genetic information in eukaryotes Carry genetic information in eukaryotes Made of DNA and proteins Made of DNA and proteins.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4.8 Mitosis maintains the chromosome number of the parent.
Mitosis and the Cell Cycle Cell reproduction. Todays Objectives The student will be able to identify the phases of the cell cycle and mitotic stages by.
Mitosis: The Dance of the Chromosomes. Once Interphase is done the cell is ready to begin Mitosis. Mitosis is when the cell divides.
Cell Cycle IPMATC. Cell Cycle 3 Parts: – Interphase – Mitosis Prophase Metaphase Anaphase Telophase – Cytokinesis.
Cell Growth and Division Mitosis and Meiosis. Cell Growth When an organism grows, the number of cells increase but the size of each cell remains small.
Meiosis. Meiosis is the type of division which: 1. Reduces the chromosome # from diploid to haploid 2. Is used to produce gametes: eggs and sperm.
Cell Cycle and Mitosis. The Cell Cycle: life of a cell from first formation (from a dividing parent cell) to its own division into 2 cells. Before a.
Phases of Cell Division Interphase (stage between cell division) Interphase (stage between cell division) Prophase Prophase Metaphase Metaphase Anaphase.
Chapter 8: Cell Reproduction. Review OrganellesCentrioles Made of microtubules Acts as anchors in cell division Mitotic Spindle fibers Two Main types.
Cell Cycle Vocabulary and Notes Biology. Centrioles – one of two tiny structures located in the cytoplasm of animal cells near the nuclear envelope. Chromatid.
MEIOSIS AND SEXUAL LIFE CHANGES. YOU MUST KNOW… THE DIFFERENCES BETWEEN ASEXUAL AND SEXUAL REPRODUCTION THE ROLE OF MEIOSIS AND FERTILIZATION IN SEXUALLY.
Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2.
Meiosis Pgs Human body cells have 46 chromosomes Meiosis - General Overview Sexual Reproduction and Genetics Each parent contributes 23 chromosomes.
End Show Slide 1 of 38 Copyright Pearson Prentice Hall 10-2 Cell Division.
Mitosis and Cytokinesis B-2.6 Summarize the characteristics of the cell cycle: interphase (called G1, S, G2); the phases of mitosis (called prophase, metaphase,
Cell Division Mitosis Chapter 10. Why do cells divide, rather than continually grow forever? The larger a cell becomes, the more demands the cell places.
Copyright © by Holt, Rinehart and Winston. All rights reserved. How are autosomal cells and sex cells different? Question of the Day 2-25.
Cell Reproduction Prokaryotes Bacteria Eukaryotes Plants & animals copyright cmassengale.
THE CELL CYCLE. The Cell Cycle Events that occur in the life of a cell. Includes 3 major stages: 1.Interphase 2.Mitosis 3.Cytokinesis.
Biology AHSGE Standard VI- Mitosis and Meiosis. Biology AHSGE CONTENT STANDARD 6. Describe the roles of mitotic and meiotic divisions during reproduction,
Cell Cycle and Cell Division CST Review PowerPoint.
Cell Division. Two Parts of Cell Division (1) Mitosis – (2) Cytokinesis.
Cell Growth and Reproduction. Limitations on Cell Size Diffusion Larger the cell, the longer it takes to get nutrients from outside the cell through diffusion.
Cell Division and Mitosis. Understanding Cell Division What instructions are necessary for inheritance? How are those instructions duplicated for distribution.
Inquiry into Life Twelfth Edition Chapter 5 Lecture PowerPoint to accompany Sylvia S. Mader Copyright © The McGraw-Hill Companies, Inc. Permission required.
The cell cycle and mitosis. Cells constantly reproduce exact duplicates of themselves. Why? Replacement Repair Growth.
I.Sexual Reproduction --two parents combine. 1. The sex cell from the male parent is sperm. a. Sperm head is almost all nucleus (genetic info) 2. The.
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