Published on March 9, 2014
JL Broadhurst 201242029
Cell division for sex-cells. Sex Cells: Are also called Gametes. You know them as SPERM and EGG cells
2 divisions: Meiosis I and Meiosis Starting with ONE (diploid) cell, II ending with FOUR (haploid) cells.
Interphase: Chromosomes duplicate and build up energy for meiosis
Meiosis I Prophase I Metaphase I Anaphase I Telophase I Meiosis II Prophase II Metaphase II Anaphase II Telophase II
Prophase I- chromosome becomes visible and the nuclear membrane disappears; homologous chromosome appears and share fragments called crossing over
Meiosis I Metaphase I - complete disappearance of nuclear membrane and appearance of spindle fiber; centromeres attached to the spindle fiber and lies on the metaphase plate.
Meiosis I Anaphase I homologous chromosome separates from each other but centromere do not divide; chromosome continues to consists of two chromatids
Meiosis I Telophase I chromosomes are still doubled; nuclear membrane is formed and disappearance of spindle fiber
cells have one chromosome
Meiosis II Metaphase II chromosomes align at the metaphase plate; centromeres divide thus separating the chromatids
Meiosis II Anaphase II each new daughter cell move towards opposite poles
Meiosis II Telophase II spindle disappears; nuclear membrane is formed; nuclei are formed and cytokinesis happens
Mitosis makes cells for growth, development, repair, and is a form of asexual reproduction Meiosis makes gametes for sexual reproduction
Mitosis produces two cells identical to the parent cell (diploid called daughter cells) Meiosis produces four cells with half the number of chromosomes as the parent (haploid)
In the first cell division, CHROMOSOME PAIRS (HOMOLOGOUS CHROMOSOMES) are separated. In the second cell division, SISTER CHROMATIDS are pulled apart.
In meiosis, “crossing over” occurs during prophase I. Chromosomes form tetrads Homologous chromosomes “swap” parts of their DNA leads to recombination, or genetic variation
http://www.slideshare.net/imkaelah/meiosis-lesson?qid=bf07a3ac-c563-4350-af21-a255071068 Meiosis lesson by imkaelah on Jul 24, 2013 http://www.slideshare.net/mmravagnan/powerpoint-meiosis?qid=bf07a3ac-c563-4350-af21a255071068ef&v=qf1&b=&from_search=18 Powerpoint meiosis by Magdalena Ravagnan, Veterinaria, Biology teacher from Argentina on Jun 16,2013 http://www.slideshare.net/MRKALEMBER/meiosis-in-depth?qid=bf07a3ac-c563-4350-af21a255071068ef&v=qf1&b=&from_search=3 Meiosis in depth by Jeff Kalember on Jan 30, 2014 http://www.slideshare.net/mjurkiewicz/meiosis-29211193?qid=bf07a3ac-c563-4350-af21a255071068ef&v=qf1&b=&from_search=9 Meiosis by mjurkiewicz on Dec 14, 2013 http://www.slideshare.net/rozeka01/biology-unit-4-cell-division-meiosisnotes?qid=bf07a3ac-c563-4350-af21-a255071068ef&v=qf1&b=&from_search=10 Biology unit 4 cell division meiosis notes by rozeka01 on Dec 12, 2013
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