Cell Cycle Events that occur from when a cell is made until it has divided into 2 new cells. Mitosis Nucleus splits Interphase Growth, synthesis, DNA replication.

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Presentation transcript:

Cell Cycle Events that occur from when a cell is made until it has divided into 2 new cells. Mitosis Nucleus splits Interphase Growth, synthesis, DNA replication Cytokinesis Cytoplasm splits into 2 cells

Chromatids REMIND ABOUT TERM CHROMATID = when chromosomes replicated and joined by centromere

Mitosis video Click here for video

Mitosis 4 Phases:- Prophase Metaphase Anaphase Telophase

Prophase Chromatids condense (shorter and thicker) Nuclear membrane disintegrates Centrioles separate Spindle starts to form from centrioles

Metaphase Spindle has been formed Chromatids attach to spindle by centromere Chromatid pairs line up, in single file, along equator of cell

Anaphase Centromeres split into 2 Spindle fibres shorted to pull chromosomes to poles Chromosomes pulled towards pole, centromere first

Telophase Spindle disintegrates Nuclear membrane reforms (cell has 2 nuclei)

Key Words Chromatid - prophase Centromere - metaphase Spinde fibres - anaphase Equator - telophase Nuclear envelope poles

Mitosis Stage Chromosomes Other events Prophase Consist of 2 chromatids joined by centromere Condense (shorter and fatter) Become visible Nuclear envelope disintergrates Centrioles at poles Spindle starts to form Metaphase Still consist of 2 chromatids joined by centromere Centromeres attach chromatid pairs to spindle fibres Chromatid pairs line up along the equator of the cell Spindle formed Anaphase Centromere holding chromatids splits to separate the chromatids (when split = chromosomes) Chromosomes pulled to opposite poles by spindle fibres contracting Pulled centromere first Spindle fibres contract Telophase Become long and thin = not visible Nuclear envelop forms around chromosomes at each end of cell Spindle disintergrates

Mitosis

Interphase Prophase Metaphase Anaphase Telophase 1

Interphase Prophase Metaphase Anaphase Telophase 2

Interphase Prophase Metaphase Anaphase Telophase 3

Interphase Prophase Metaphase Anaphase Telophase 4

Interphase Prophase Metaphase Anaphase Telophase 5

Interphase Prophase Metaphase Anaphase Telophase 6

Interphase Prophase Metaphase Anaphase Telophase 7

Answers

Interphase Prophase Metaphase Anaphase Telophase 1

Interphase Prophase Metaphase Anaphase Telophase 2

Interphase Prophase Metaphase Anaphase Telophase 3

Interphase Prophase Metaphase Anaphase Telophase 4

Interphase Prophase Metaphase Anaphase Telophase 5

Interphase Prophase Metaphase Anaphase Telophase 6

Interphase Prophase Metaphase Anaphase Telophase 7

Cell division – label as many things as possible

Write a poem following the rules below. Your first word is “MITOSIS” Task Write a poem following the rules below. Your first word is “MITOSIS” One word for the idea e.g. school Two words to explain the meaning of the idea e.g. learn things Three words to describe what the idea does e.g. educate and train Four words to explain what the idea means to you e.g. interesting and fun activities One final word for the idea e.g. education

Feature Mitosis Meiosis Number of divisions 1 2 Number of daughter cells 4 Diploid or haploid cells produced? Diploid Haploid How do chromatid pairs line up for first division Single file In homologous pairs (as bivalents What is split in first division Chromatid pairs Chromosome pairs Variation in daughter cells? No (unless mutation) Yes

Feature Mitosis Meiosis Number of divisions Number of daughter cells Diploid or haploid cells produced? How do chromatid pairs line up for first division What is split in first division Variation in daughter cells?