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Mitosis lab report for cellular and molecular biology
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Marina Perez 04/18/
Abstract This lab exercise is composed of drawings for visual representation and understanding. Unlike previous lab activities this is not an experiment that requires the use of scientific methods or hypothesis testing. The purpose of this assignment is to grasp the concepts of the various stages in the mitotic cell cycle. Introduction In the life of a cell, there are many cellular processes. The cell cycle is a process by which the nucleus and its genetic information is divided to produce an identical copy of itself. In this lab, the cell cycle being observed will contain examples of interphase in mitosis. Interphase is made up of three parts, G1, S and G2. Mitosis is made up of five parts, prophase, prometaphase, anaphase, and telophase. Eukaryotic organisms contain a lifecycle with genetic information that is able to be efficiently replicated without losing any DNA. When one cell divides into two cells, mitosis is responsible for the distribution of two complete sets of chromosomes. For mitosis to happen first interphase must copy each chromosome and sister chromatids Methods Answer the following questions:
In humans how many chromosomes are in the cell prior to mitosis? How many chromosomes are in each cell that is produced by mitotic cell division in humans? (Marion, 2018) Draw G1 as it would look if the DNA were artificially condenses into chromosomes, and if the nuclear envelope were artificially removed (Marion, 2018). Draw G2. Draw metaphase. Draw anaphase. Answer the question: How does the genetic information in the original cell represented in G1 differ from the cell represented in anaphase? Observe onion root tip cells, and draw the mitotic cell division as it appears under the microscope. Results
Discussion Sister chromatids are produced when the interphase divides the DNA molecule into two identical copies. A homologous pair of chromosomes consists of one chromosome from a sperm and one from an egg for each pair. The same gene may be present in homologous pairings, and distinct alleles are also present. Sister chromatids are exact replicas of one another. References Biology 211 cellular and organismal biology, New Mexico State University 12th edition, Amy L. Marion, Laura Lowell Haas, Ralph W. Preszler.