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Презентация на тему Meiosis. Stages of meiosis
Содержание
- 2. Meiosis is a kind of cell division
- 3. Stages of meiosisMeiosis steps: meiosis I, cytokinesis
- 4. Prophase IChromosomes comes together in pairs, each
- 5. Metaphase ITetrads line up on the equatorial
- 6. Anaphase IHomologous chromosomes separates to opposite poles
- 7. Telophase IMovement of homologous chromosomes continues Haploid set of chromosome formsCytokinesis occurs simultaneously.
- 8. Meiosis IIAfter meiosis I cells immediately begins second division, meiosis II
- 9. Prophase IISame as prophase I
- 10. Metaphase IIChromosomes stay at the equator
- 11. Anaphase IIChromatids moves to poles (Chromosomes split into 2 part)
- 12. Telophase IINucleus appearsChromosomes starts uncoil (becomes invisible)Cytokinesis begins (Dividing of cytoplasm)
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Meiosis is a kind of cell division in which chromosome number is reduced by half.Meiosis produces haploid (n) cells with new combination.
Слайд 2
Meiosis is a kind of cell division in
which chromosome number is reduced by half.
(n) cells with new combination.
Слайд 3
Stages of meiosis
Meiosis steps: meiosis I, cytokinesis (interkinesis),
meiosis II, cytokinesis.
Meiosis I, each of double set of
chromosome is replicated to produce complete copy of every genes.
Слайд 4
Prophase I
Chromosomes comes together in pairs, each pair
called tetrad (complex of 4 chromatids)
Chromatids of chromosomes cross
over and exchange the genetic material.Nucleus membrane disappears
Centrioles moves to poles
Слайд 5
Metaphase I
Tetrads line up on the equatorial plane.
Chromosomes
attaches to the spindle fiber extending from poles (centrioles)
Слайд 7
Telophase I
Movement of homologous chromosomes continues
Haploid set
of chromosome forms
Cytokinesis occurs simultaneously.
Слайд 12
Telophase II
Nucleus appears
Chromosomes starts uncoil (becomes invisible)
Cytokinesis begins
