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.
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Презентация на тему Meiosis
Содержание
- 2. Cell division to form the gametes, sperm
- 3. CHROMOSOMES
- 4. Characters of living things are carried by
- 5. CHROMOSOME
- 6. Chromosome Number1 pair from mother1 pair from
- 8. Meiosis is a special cell division which
- 9. Meiosis needs two sex cellsa. Sperm: male sex cellb. Egg: female sex cell
- 11. MEIOSIS
- 13. STAGES OF MEIOSISThe Meiosis consists of two cell divisions:MEIOSIS-IMEIOSIS-II
- 14. Stages Of Meiosis: Meiosis I
- 15. Telophase IStages Of Meiosis: Meiosis IIThe
- 16. MEIOSIS-IAt the start of meiosis, cells have
- 17. INTERPHASE
- 18. PROPHASE-ISpindle fibers are formed by centrioles.Nuclear membrane
- 19. PROPHASE 1
- 20. CROSSING-OVERPairs of homologous chromosomes forms the TETRADS.The
- 21. Crossing OverBecause 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-INuclear membranes are formed. The cytoplasm divides forming two daughter cells.
- 29. TELOPHASE 1
- 30. The interphase between meiosis I and meiosis
- 31. PROPHASE-IIEach of the daughter cells forms a
- 32. PROPHASE 2
- 33. METAPHASE-IIThe chromosomes become attached to the spindle
- 34. METAPHASE 2
- 35. ANAPHASE-IIThe Centromers divide and the sister chromatids
- 36. ANAPHASE 2
- 37. TELOPHASE-IIBoth daughter cells divide forming 4 haploid cells. The nuclear membrane reforms.
- 38. TELOPHASE 2
- 39. ACTIVITY
- 40. ACTIVITY
- 41. ACTIVITY
- 42. ACTIVITY
- 44. Скачать презентацию
- 45. Похожие презентации
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 geneNeed to choose 1 copy of each gene randomly.
Слайд 2 Cell division to form the gametes, sperm (male
gamete) and egg (female gamete).
copies of every gene.Gametes are haploid: 1 copy of every gene
Need to choose 1 copy of each gene randomly.
Слайд 4 Characters 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.
Слайд 6
Chromosome Number
1 pair from mother
1 pair from father
Humans=
23 pairs or 46 total chromosome
Homologous Chromosomes are the
sets of each pairСлайд 8 Meiosis is a special cell division which takes
place in reproductive organs such as gametes or spores
of living things .
Слайд 15
Telophase 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 16
MEIOSIS-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.
Слайд 18
PROPHASE-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.
Слайд 20
CROSSING-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.
Слайд 21
Crossing 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.
Слайд 30 The 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.
Слайд 31
PROPHASE-II
Each of the daughter cells forms a spindle
and the double stranded.
Chromosomes move toward the middle
of the cell.
Слайд 33
METAPHASE-II
The chromosomes become attached to the spindle fibers
at their centromers.
And the chromosomes line up on the
equator.
Слайд 35
ANAPHASE-II
The Centromers divide and the sister chromatids seperate.
The chromatids move tovard the opposite poles of the
cells.
Слайд 37
TELOPHASE-II
Both daughter cells divide forming 4 haploid cells.
