DNA, Mitosis, Meiosis

DNA, Mitosis, Meiosis - BIOS 1063 Cellular Basis of...

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BIOS 1063 Cellular Basis of Reproduction and Inheritance A. Overview: You start as a single cell Zygote (fertilized egg by a sperm). A parent cell that divides to form 2 genetically identical daughter cells is mitosis (also called asexual reproduction). Mitosis is the process by which millions of cells are made every second in your body, new skin cells, new blood cells, new bone cells etc. Mitosis is how our body maintains itself. Old and damaged cells die, new cells are made. Many organisms like the protists, amoeba and paramecium, reproduce by mitosis to make new organisms. Humans have 46 chromosomes. Each of the 46 chromosomes replicates itself to form a copy before Mitosis or Meiosis occurs. The two identical chromosomes (the original + the copy) will join together to form Sister chromatids. II. Cell Cycle and Mitosis A. Cell Cycle G1, S, and G2= Interphase of the cell cycle. 90% of a cell’s cycle is spent in interphase. S phase-DNA replicates-S stands for synthesis of new DNA. B. Mitosis : Cells divide into 2 daughter cells with identical chromosomes and genes. Human cells have 46 chomosomes, and they undergo mitosis they make 2 identical daughter cells with each one containing 46 chromsomes. The 2 daughter cells are genetically identical to the parent cell that divided. You do need to know the following: When DNA replicates during S phase, each chromosome makes a replicated copy of itself. When the cell gets ready to go through mitosis-it binds to its identical copy— called a sister chromatid. 1. Sister chromatids line up across the equator of the cell during metaphase 2. Cytokinesis is the separation of cytoplasm to form 2 daughter cells . Cytokinesis occurs during Telophase.
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DNA, Mitosis, Meiosis - BIOS 1063 Cellular Basis of...

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