Biology Mitosis Lab

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AP BIOLOGY-
Mitosis and Meiosis Cell Division Lab

Part 1-MITOSIS

summary:
In this experiment first the stages of an onion cell undergoing mitosis are going to be observed and every stage is going to be detected and drawn on paper. A brief description to what is going on should be attached to the pictures. This is important to understand the basics of cell division which is necessary growth,repair and asexual reproduction. Second the number of cells undergoing each phase is going to be counted to figure out in which phase the cell remains the most. If interphase is the stage in which the cell grows and prepares for cell division then the number of cells undergoing interphase will be the most. After cells were counted it came out that indeed the number of cells in interphase is the most followed by prophase, metaphase=anaphase and telophase. This makes us come to the conclusion that the longest phase for a cell is interphase in which the cell grows and gets ready to divide. The second longest in prophase in which the chromatin fibers start to form chromosomes. The other phases which follow are very short and quick.

Introduction:

Mitosis is the division of the nucleus,providing equal amounts of nuclear material to the daughter cells,in eukaryotes. Equal amounts of chromosomes are provided for the forming daughter cells by replicating the DNA and chromosomes before the division. Mitosis occurs in somatic cells and produces 2 daughter cells. The whole process of mitosis consists of 5 stages.

1-Interphase:is the stage in which the cell rests and gets ready for division. Consists of 3 parts.
-G1:number of organelles double,size increases. At the end of this phase is a G1 checkpoint which controls is the cell is ready for division or not.
-S:chromosomes are duplicated.
-G2:special proteins and enzymes for cell division are synthesized.

2-Prophase:Centrioles

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