Mitosis and Meiosis Purpose To understand the cell cycle and mitosis and how these two processes function within an organism. To understand meiosis and how this process produces gametes. Mitosis All cells in your body complete a cell cycle in which they grow‚ divide and‚ eventually‚ die. The cell cycle consists of four phases: G1‚ S‚ G2‚ and M (Figure 1). Each phase is associated with a specific cellular function: typically growth‚ synthesis‚ and division. The G1‚ S‚ and G2 phases comprise
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Meiosis and Mitosis Meiosis vs. Mitosis: Meiosis requires two nuclear divisions‚ but mitosis requires only one nuclear division. Meiosis producers four daughter nuclei‚ and there are four daughter cells following cytokinesis; mitosis followed by cytokinesis results in two daughter cells. Following meiosis‚ the four daughter cells are haploid and have half the chromosome number as the parent cell. Following mitosis‚ the daughter cells have the same chromosome number as the parent cell. Following
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Meiosis I Prophase I: - nuclear membrane dissolves * centrioles move to poles * spindle fibres forming * DNA has been replicated and forms chromosomes made of 2 identical chromatids * Homologous chromosomes line up to form a bivalent‚ 2 chromosomes or 4 chromatids (TETRAD)‚ this process is called SYNAPSIS * Where chromatids overlap is called a CHIASMATA‚ and it allows for CROSSING OVER of genetic information between chromosomes Metaphase I: - homologous chromosomes
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Crossing Over: Family The main idea in this chapter (number 1 question) is about the author returned to Cheran City‚ the time he spent with the Chavez’s family and his visits with Dr. Tito and Doña Elisa‚ a shurikis. The writer’s second home in Cheran City is the only hotel in town‚ a dilapidated two-story with moldy mattresses and water-stained walls. The writer became close to the Chavez’s Family. Wence Cortez‚ Rosa Chavez’s husband‚ considered Mr. Martiñez as an older brother and adviser.
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Meiosis BIOL 1111 Introduction Meiosis is the second important kind of nuclear division. It resembles mitosis in many ways but the consequences of meiotic divisions are very different from those of mitotic divisions. While mitotic division may occur in almost any living cell of an organism‚ meiosis occurs only in special cells. In animals‚ meiosis is restricted to cells that form gametes (eggs and sperm). Each species has a characteristic number of chromosomes per somatic cell. Fruit flies
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Mitosis and Meiosis I. These two processes function to pass chromosomes from one cellular generation to the next in a very carefully controlled manner. II. Mitosis and Meiosis are both correctly described as nuclear division; they are never correctly called cell division‚ or any kind of reproduction. It is possible (and often quite normal) for nuclei to divide when cells don’t. And organisms reproduce; nuclei and cells divide. III. Mitosis A. Mitosis is the division of a nucleus
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Meiosis is a type of cell division that is used for sexual reproduction. It creates the egg and the sperm cells. Meiosis begins with a parent cell (diploid)‚ which contains two copies of each chromosome. The cell then goes through DNA copying and two cycles of cell division‚ also known as Meiosis I and Meiosis II. When the cell goes through this cycle‚ it creates four haploid‚ which means they contain half of the number of chromosomes of the parent cell. Meiosis I begins with Prophase I. In Prophase
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1 – Mitosis and Meiosis 1. A certain species has three pairs of chromosomes: an acrocentric pair‚ a metacentric pair‚ and a telocentric pair. Draw a cell of this species as it would appear in metaphase of mitosis. (BAP 2.18) 2. A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages? (BAP 2.20) a) G2 of interphase b) Metaphase I of meiosis c) Prophase of mitosis d) Anaphase I of meiosis
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and associated proteins) condenses into chromosomes. Each replicated chromosome comprises two chromatids‚ both with the same genetic information. Microtubules of the cytoskeleton‚ responsible for cell shape‚ motility and attachment to other cells during interphase‚ disassemble Pro Metaphase: - nuclear envelope breaks down- no longer a recognizable nucleus. Mitotic spindle fibers elongate from the centrosomes and attach to kinetochores‚ protein bundles at the centromere region on the chromosomes
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Erin Turner Sordaria Outline 1) Introduction a) Natural laboratory in Israel‚ known as the evolutionary canyon‚ provides idea location to observe the crossing over frequency in Sordaria a.i) South facing slope is much more dry and harsh of a climate a.ii) North facing slope is a more temperate climate a.iii) Since these two drastically different climates are in close proximity to each other it creates an ideal study location b) In this particular lab study we collected baseline data concerning
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