4 Biology (40241)

4 4.1 4.2 4.2.1 4.2.2 4.2.3 4.3 4.3.1 4.3.2 4.4 4.5 4.5.1 4.5.2 4.6 4.7

(Cell division)

Meiosis

MeiosisMeiosis (reduction) (testes), (ovary), (anther), (ovule), (sporangium) (cone) 1 (haploid , n)

Meiosis: Sexual Reproduction http://io.uwinnipeg.ca/~simmons/1115/cm1503/meiosis.htm

http://io.uwinnipeg.ca/~simmons/1115/cm1503/meiosis.htm

Meiosis 2 1. Meiosis - I Reductional division homologous chromosome 5 Interphase- I Prophase - I Metaphase - I Anaphase - I Telophase - I 2. Meiosis - II Equational division chomatid 4 - 5 Interphase - II ()Prophase - II Metaphase - II Anaphase - II Telophase - II 4 n (Haploid)

Meiosis I

Interphase I DNA 1 1 1 2

Prophase I 5 1. Laptotene2. Zygotene3. Pachytene4. Diplotene5. Diakinesis

1. LeptoteneChromosome (threadlike structure) nucleolus http://www.vcbio.science.ru.nl/eng/virtuallessons/cellcycle/meiostage/leptotene/

2. Zygotene Homologous Chromosome Synapsis bivalent 4 tetrad 23 23 http://genetika.upol.cz/cz/meioza.htm

3. Pachytenehomhlogous chromosome chiasma homhlogous chromosome crossing over nonhomhlogous chromosome translocation 2 (geng variation) (variation) http://genetika.upol.cz/cz/meioza.htm

Diagram of crossing overand chiasma http://faculty.uca.edu/~benw/biol1400/notes15.htm

http://www.sirinet.net/~jgjohnso/geneticrecomb.html

4. Diplotenehomhlogous chromosome chromatid chiasma http://genetika.upol.cz/cz/meioza.htm

5. Diakinesischromosome (repel) chromosome X , 8 , O , chaiasma nuclear membrane nucleolus http://genetika.upol.cz/cz/meioza.htm

Metaphase IBivalent (homhlogous chromosome )http://genetika.upol.cz/cz/meioza.htm

Anaphase Ihomhlogous chromosome chromosome 2 chromatid chromosome 1 (haploid , n) 2n http://genetika.upol.cz/cz/meioza.htm

Telophase Ichromosome nuclear membrane nucleolus Cytoplasm (cytokinesis)chromosome meiosis II 2 chromosome 1 (haploid , n) http://genetika.upol.cz/cz/meioza.htm

Meiosis Ihttp://io.uwinnipeg.ca/~simmons/1115/cm1503/meiosis.htm

http://www.stanford.edu/group/Urchin/GIFS/

Meiosis II

Meiosis IIMeiosis - II Equational division chomatid 4 - 5 Interphase - II ()Prophase - II Metaphase - II Anaphase - II Telophase - II 4 n (Haploid) mitosis

Prophase IIchromosome , 1 chromosome 2 chromatid spindle fiber nuclear membrane , nucleolus http://genetika.upol.cz/cz/meioza.htm

Metaphase IIchromosome (equatorial plate , metaphase plate)http://genetika.upol.cz/cz/meioza.htm

Anaphase IICentromere chromosome Spindle fiber chromatid chromosome Chromatid chromosome daughter chromosomehttp://genetika.upol.cz/cz/meioza.htm

Telophase IIdaughter chromosome Spindle fiber nuclear membrane , nucleolus cytokinesis 1 (diploid , 2n) 4 (haploid , n) ?http://genetika.upol.cz/cz/meioza.htm

Diad , Tetradhttp://genetika.upol.cz/cz/meioza.htm

Meiosis IIhttp://io.uwinnipeg.ca/~simmons/1115/cm1503/meiosis.htm

www.stanford.edu/group/ Urchin/GIFS/bmeiosis.gif

http://www.sirinet.net/~jgjohnso/geneticrecomb.html

http://www.bio.miami.edu/dana/250/meiosis.jpg

Meiosis

During the Process of Meiosis :Meiosis I : is a division sequence that separated the sets of homologous chromosomes to produce two daughter cells that have half the normal number of chromosomes - i.e. they are haploid.Meiosis II : is the second half of the process whereby the sister chromatids are divided and separated into daughter cells (much as in mitosis).

Mitosis1. somatic cell2. 1 cell 2 cells3. 4. synapsis5. crossing over6. chromatid anaphaseMeiosis1. germ cell2. 1 cell 4 cells3. 4. synapsis5. crossing over6. chromatid anaphase II

biology.clc.uc.edu/ courses/bio104/meiomito.htm

Comparison of Meiosis and Mitosis

References . -. ; 2548.http://genetika.upol.cz/cz/meioza.htmhttp://io.uwinnipeg.ca/~simmons/1115/cm1503/meiosis.htm

Thank youMiss Lampoei PuangmalaiDepartment of scienceSt. Louis College Chachoengsao

http://www.biology.iupui.edu/biocourses/N100/2k4ch9meiosisnotes.html

http://www.biology.iupui.edu/biocourses/N100/2k4ch9meiosisnotes.html