![Page 1: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/1.jpg)
MEIOSISMEIOSIS
Object: to study the meiosis through Object: to study the meiosis through its subsequent developmental stages its subsequent developmental stages and discuss its Genetics Significant..and discuss its Genetics Significant..
![Page 2: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/2.jpg)
• Meiosis in Meiosis in malesmales is called is called spermatogenesisspermatogenesis and produces and produces spermssperms..
• Meiosis in Meiosis in femalesfemales is called is called oogenesisoogenesis and and produces produces ovaova..
•Two divisionsTwo divisions ( (meiosis I meiosis I and and meiosis IImeiosis II).).
MeiosisMeiosis
![Page 3: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/3.jpg)
2n
n
n
1 cell division: 1 cell division: 2 daughter cells2 daughter cells
2 cell divisions: 2 cell divisions: 4 cells product 4 cells product of meiosisof meiosis
2n
2n
2nn
n n
n
n=chromosome numbern=chromosome number
Somatic cellsSomatic cells
Cells in sexual cycleCells in sexual cycle
MITOSISMITOSIS
MEIOSISMEIOSIS
![Page 4: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/4.jpg)
definitionsdefinitions
• Homologous Homologous chromosomes:chromosomes: the members of a the members of a chromosome pair chromosome pair that is identical that is identical in the in the arrangement of arrangement of genesgenes
![Page 5: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/5.jpg)
Homologous ChromosomesHomologous Chromosomes
PaternalPaternal MaternalMaternal
eye coloreye color locuslocus
eye coloreye color locuslocus
hair colorhair color locuslocus
hair colorhair color locuslocus
![Page 6: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/6.jpg)
• Synapsis: (Synapsis: (التشابكالتشابك)) the intimate association the intimate association
وثيق وثيق ترابط of ) of (((ترابطhomologous homologous chromosomes…chromosomes…
Homologous chromosomes
definitionsdefinitions
![Page 7: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/7.jpg)
definitionsdefinitions
• Crossing-over: Crossing-over: ((العبورالعبور))
a term describing the a term describing the process of process of reciprocal reciprocal chromosomalchromosomal interchange by which interchange by which recombinants ariserecombinants arise
![Page 8: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/8.jpg)
Crossing overPairing of
homologous chromosomesChiasmaChiasma formationChromosomes
Breakage and joining
Recombinant chromosomes
![Page 9: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/9.jpg)
MEIOSIS I
• Prophase I
• The The longestlongest phase. phase. This phase can be This phase can be divided into 5 stages;divided into 5 stages;
a)a) LeptoteneLeptoteneb)b) ZygoteneZygotenec)c) PachytenePachytened)d) DiploteneDiplotenee)e) DiakinesisDiakinesis
![Page 10: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/10.jpg)
1 .Leptotene
2.Zygotene
3.Pachytene 4.Diplotene 5.Diakinesis
Prophase I
![Page 11: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/11.jpg)
Metaphase I Anaphase I
Telophase IProphase II
Prophase I
![Page 12: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/12.jpg)
Meiosis 2Meiosis 2ndnd division: division: like mitosislike mitosis with haploid set with haploid set
![Page 13: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/13.jpg)
4 Haploid cells Gametes4 Haploid cells Gametes
![Page 14: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/14.jpg)
![Page 15: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/15.jpg)
Mitosis vs MeiosisMitosis vs Meiosis
MitosisMitosis MeiosisMeiosisResults inResults in 2 Diploid Cells 2 Diploid Cells
(2N)(2N)4 Haploid Cells 4 Haploid Cells (N)(N)
Cells areCells are Genetically Genetically IdenticalIdentical
Genetically Genetically DifferentDifferent
Occurs inOccurs in Somatic (Body) Somatic (Body) CellsCells
Sex CellsSex Cells
![Page 16: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/16.jpg)
Prophase IProphase I
Slides for Meiosis I & II:Slides for Meiosis I & II:
![Page 17: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/17.jpg)
Metaphase I:Metaphase I:
![Page 18: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/18.jpg)
Anaphase I:Anaphase I:
![Page 19: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/19.jpg)
Telophase I:Telophase I:
![Page 20: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/20.jpg)
Prophase II:Prophase II:
![Page 21: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/21.jpg)
Metaphase II:Metaphase II:
![Page 22: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/22.jpg)
Anaphase II:Anaphase II:
![Page 23: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/23.jpg)
Telophase II:Telophase II:
![Page 24: MEIOSIS Object: to study the meiosis through its subsequent developmental stages and discuss its Genetics Significant](https://reader035.vdocuments.net/reader035/viewer/2022062905/5a4d1aed7f8b9ab05997bb15/html5/thumbnails/24.jpg)
Final result
Meiosis :Four genetically different haploid cells from one diploid parent cell
Mitosis :two genetically identical diploid cells from one diploid parent cell