I need help with my Biology lab please see the attached files

The Cell Cycle Lab Page 1 of 6 Student Name: _________________________ The Cell Cycle Lab Introduction : As the basis for all living organisms, new cells must be produced. Just as organisms have life cycles, cells have the cell cycle . The majority of a cell’s time is spent in the “everyday” portion of its life, called Interphase . As when organisms reproduce, only a fraction of the entire cycle is spent in reproduction for cells. Cell reproduction is divided into 2 major parts: cyto kinesis and karyokinesis. Cytokinesis is the division of the cytoplasm (and everything in the cytoplasm except for the nucleus) into 2 new smaller, equally -sized identical daughter cells, each with their own cytoplasm and cell membrane. Karyokinesis deal s with division of the nucleus and everything within it - most importantly, DNA bundled into chromosomes. The cells of an organism NOT involved in sexual reproduction are called somatic cells . They undergo MITOSIS , which is the process that divides th e chromosomes into 2 equal and complete double sets ( 2n or diploid ) for each new daughter cell . Cells that are directly involved in sexual reproduction are called gametes . They undergo MEIOSIS , a two -part process that eventually divides the chromosom es into 4 equal (yet genetically unique) single sets ( 1n or haploid ) for each new daughter cell produced. These haploid cells develop into either egg or sperm cells . This occurs in organisms so that sexual reproduction yields a new organism with a comple te double set of chromosomes (½ from egg and ½ from sperm). To review the concepts of the cell cycle, mitosis, meiosis I or meiosis II, DNA, etc. Click on the links below: http://www.pbs.org/wgbh/nova/miracle/divide.html Requires free Adobe Flash Player Software: http://get.adobe.com/flashplayer/ http://www.biology.arizona.edu/cell_bio/cell_bio.html Go to the website above and complete the Cell Cycle & Mitosis tutorial and the Meiosis tutorial. The Cell Cycle Lab Page 2 of 6 Student Name: _________________________ Part 1: Mitosis in Onion Root Tips • Click on the link to go to the Cell Biology Section of the Biology Project : Online Onion Root Tips http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cyc le.html • Complete the Mitosis tutorial by clicking on “Next” at the bottom of each page to advance. • Identify the cell’s stages and count the totals at the end of the exercise. • Complete the table below. Record the number of cells you count in the phase s and calculate the percentages for each cell stage, too. Formula: ((Number of cells in that phase / Total Number of Cells) * 100). Interphase Prophase Metaphase Anaphase Telophase Total Number of Cells 36 Percent of Cells 100% Part 2: Cell Cycle Sketches 1. Draw a cell “at rest” during Interphase. Write a description of what is going on in the cell, too. Written Description Drawing Interphase The Cell Cycle Lab Page 3 of 6 Student Name: _________________________ 2. Draw a cell (with at least 3 pairs of chromosomes) going through each phase of mitosis (PMAT). Write a description of what is going on in the cell, too. Be sure to include what is going on with the chromosomes, where they are, and how they are being move d through the cell during the specific phase. Mitosis Written Description Drawing Prophase Metaphase Anaphase The Cell Cycle Lab Page 4 of 6 Student Name: _________________________ Telophase 3. Draw a cell (with at least 3 pairs of chromosomes) going through each phase of meiosis I and II. Write a description of what is going on in the cell, too. Be sure to include what is going on with the chromosomes, where they are, and how they are being mo ved through the cell during the specific phase. Meiosis I Written Description Drawing Prophase I Metaphase I The Cell Cycle Lab Page 5 of 6 Student Name: _________________________ Anaphase I Telophase I Meiosis II Written Description Drawing Prophase II Metaphase II The Cell Cycle Lab Page 6 of 6 Student Name: _________________________ Anaphase II Telophase II