Biology Lab #9 Mitosis and Meoisis

Biology Lab #9 Mitosis and Meoisis - cleavage furrow, there...

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Benny Wong 11/30/09 Monday Biology Lab #9 Mitosis and Meiosis Purpose In this lab, mitosis and meiosis were introduced. Mitosis is the process by which somatic cells and single-celled organisms divide. The nucleus divides and is followed by cytokinesis, the division of the cytoplasm. This results in two daughter nuclei that are identical to the parent cell. Each is the genetic equivalent of the parent cell. In mitosis, the cell undergoes the cell cycle that is broken up into the G 1 , S and G 2 phases. During the G 1 phase, the cell grows. The cell continues to grow as it copies its chromosomes during the S phase and finally grows more during the G 2 phase. After the G 2 phase the cell goes into the M phase, where prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis. The differences between mitosis in animal and plants cells is that when animals cells separate during cytokinesis, the two cells cleave apart by a cleavage furrow. In plant cells, instead of a
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Unformatted text preview: cleavage furrow, there is a cell wall. Meiosis takes place in multicellular organisms that prepare for sexual reproduction. The cells created are haploid cells because they contain only half of the chromosomes of the parent cell. This results in four daughter cells. There is meiosis I and II. The process of meiosis contributes to the genetic variation that is seen in the offspring of the parents. Recombination of chromosomes is due to crossing over and random fertilizations. Results Lab Study A. There is no plate wall in the animal cells, and there were spindle fibers present. Significance: There were many noticeable differences between cells that were mitotically dividing and cells that were meiotically dividing. Synapsis and crossing over occurred in meiosis and did not happen in mitosis. In animal cells, there was a cleave furrow, while the plant cells had a cell wall....
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This note was uploaded on 02/16/2011 for the course BIO 101 taught by Professor Kaplan during the Spring '11 term at CUNY City.

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