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Meiosis презентация
Содержание
- 1. Meiosis
- 2. Cell division to form the gametes, sperm
- 3. CHROMOSOMES
- 4. Characters of living things are carried by
- 5. CHROMOSOME
- 6. Chromosome Number 1 pair from mother 1
- 8. Meiosis is a special cell division which
- 9. Meiosis needs two sex cells a. Sperm: male sex cell b. Egg: female sex cell
- 11. MEIOSIS
- 13. STAGES OF MEIOSIS The Meiosis consists of two cell divisions: MEIOSIS-I MEIOSIS-II
- 14. Stages Of Meiosis: Meiosis I
- 15. Telophase I Stages Of Meiosis: Meiosis
- 16. MEIOSIS-I At the start of meiosis, cells
- 17. INTERPHASE
- 18. PROPHASE-I Spindle fibers are formed by centrioles.
- 19. PROPHASE 1
- 20. CROSSING-OVER Pairs of homologous chromosomes forms the
- 21. Crossing Over Because of crossing over, every gamete receives a unique set of genetic information.
- 22. CROSSING-OVER
- 23. CROSSING-OVER
- 25. METAPHASE 1
- 27. ANAPHASE 1
- 28. TELOPHASE-I Nuclear membranes are formed. The cytoplasm divides forming two daughter cells.
- 29. TELOPHASE 1
- 30. The interphase between meiosis I and meiosis
- 31. PROPHASE-II Each of the daughter cells forms
- 32. PROPHASE 2
- 33. METAPHASE-II The chromosomes become attached to the
- 34. METAPHASE 2
- 35. ANAPHASE-II The Centromers divide and the sister
- 36. ANAPHASE 2
- 37. TELOPHASE-II Both daughter cells divide forming 4 haploid cells. The nuclear membrane reforms.
- 38. TELOPHASE 2
- 39. ACTIVITY
- 40. ACTIVITY
- 41. ACTIVITY
- 42. ACTIVITY
- 44. SUMMARY
Cell division to form the gametes, sperm (male gamete) and egg (female gamete). Normal cells are diploid: 2 copies of every gene. Gametes are haploid: 1 copy of every gene Need
Слайд 2Cell division to form the gametes, sperm (male gamete) and egg
(female gamete).
Normal cells are diploid: 2 copies of every gene.
Gametes are haploid: 1 copy of every gene
Need to choose 1 copy of each gene randomly.
Normal cells are diploid: 2 copies of every gene.
Gametes are haploid: 1 copy of every gene
Need to choose 1 copy of each gene randomly.
Слайд 4Characters of living things are carried by means of a pair
of chromosomes. One of them comes from father and other comes from mother.
These pair of chromosomes is called homologous chromosomes.
Homologous chromosomes carries similar characters in same order.
These pair of chromosomes is called homologous chromosomes.
Homologous chromosomes carries similar characters in same order.
Слайд 6Chromosome Number
1 pair from mother
1 pair from father
Humans= 23 pairs or
46 total chromosome
Homologous Chromosomes are the sets of each pair
Слайд 8Meiosis is a special cell division which takes place in reproductive
organs such as gametes or spores of living things .
Слайд 15Telophase I
Stages Of Meiosis:
Meiosis II
The products of mitosis are 2
diploid cells with identical chromosomes.
The products of meiosis are 4 haploid cells each with a unique set of chromosomes.
Prophase II
Слайд 16MEIOSIS-I
At the start of meiosis, cells have the diploid number of
chromosomes.
There is interphase before start the first meiotic division.
DNA is replicated in interphase.
There is interphase before start the first meiotic division.
DNA is replicated in interphase.
Слайд 18PROPHASE-I
Spindle fibers are formed by centrioles.
Nuclear membrane and nucleolus disappear.
DNA are
shortened and thickened and to form chromosomes.
Each chromosome lines up exactly with its homologous chromosome.
Homologous chromosomes attach to their pairs and tetrads are formed.
Each chromosome lines up exactly with its homologous chromosome.
Homologous chromosomes attach to their pairs and tetrads are formed.
Слайд 20CROSSING-OVER
Pairs of homologous chromosomes forms the TETRADS.
The gen exchange between chromatids
of homologous chromosomes pairs is called crossing-over.
Crossing-over provide the variaty of species.
Crossing-over provide the variaty of species.
Слайд 21Crossing Over
Because of crossing over, every gamete receives a unique set
of genetic information.
Слайд 24
METAPHASE-I
Homologous chromosomes pairs line up on the equator.
The chromosomes attach to the spindle fibers at their centromers.
Слайд 26 ANAPHASE-I
The
homologous chromosomes of each tetrad seperate from each other.
They move to opposite poles of the cell.
The set of chromosomes around each pole is haploid.
They move to opposite poles of the cell.
The set of chromosomes around each pole is haploid.
Слайд 30The interphase between meiosis I and meiosis II is called interkinesis.
How
does interkinesis differ from the mitotic interphase in terms of S phase?
Interkinesis has no S phase
After meiosis I, each homologous chromosomes separate.
After meiosis II, each sister chromatids separate.
Interkinesis has no S phase
After meiosis I, each homologous chromosomes separate.
After meiosis II, each sister chromatids separate.
Слайд 31PROPHASE-II
Each of the daughter cells forms a spindle and the double
stranded.
Chromosomes move toward the middle of the cell.
Chromosomes move toward the middle of the cell.
Слайд 33METAPHASE-II
The chromosomes become attached to the spindle fibers at their centromers.
And
the chromosomes line up on the equator.
Слайд 35ANAPHASE-II
The Centromers divide and the sister chromatids seperate.
The chromatids move
tovard the opposite poles of the cells.
Слайд 37TELOPHASE-II
Both daughter cells divide forming 4 haploid cells.
The nuclear membrane
reforms.
