Meiosis Review Worksheet Pledge: _____1. If the sperm cell of a fruit fly has 4 chromosomes‚ then the number of chromosomes in each body cell is: a. 2 b. 4 c. 6 d. 8 e. 16 _____2. Of the following cells‚ the only one to have the haploid number of chromosomes is: a) skin b)muscle c) nerve d) connective e) ovum _____3. The diploid number is restored as a result of: a) differentiation
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exchange of genetic material between homologue chromosomes. For more information‚ refer to chapter 15 in your lab manual. Stages of Mitosis Prophase – The chromosomes within the nucleus condense. Chromosomal replication has already occurred during interphase‚ so each chromosome already has a sister chromatid. The mitotic spindle begins to form. Metaphase – The sister chromatics have migrated to the center of the cell and are aligned with the mitotic spindle. Anaphase – The centromeres split and
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DNA is condensed and packaged into nucleus j. What 2 components are found in the condensed version of DNA 18. Difference between sister chromatids and homologous chromosomes 19. 2 major phases of cell cycle k. 3 divisions of interphase ii. What happens in each phase iii. Checkpoints l. 4 phases of cell division (mitosis) iv. What happens in each phase v. Cytokinesis 1. When it happens 2. What happens
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Element: Simplest form of matter to have unique chemical properties. Atom: The smallest particles with unique chemical identities. Nucleus: Center of an atom (composed of protons and neutrons). Proton: Have a single positive charge (+1). Neutron: Have no charge. Electron: Tiny particles with a single negative charge and very low mass (-1)/determines chemical bonding properties of an atom. Atomic Number: Number of protons in the nucleus. Atomic Mass: Approximate number of protons and neutrons
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1. DNA Nucleotide [pic] Nucleotides consist of three parts --- a pentose sugar‚ a nitrogen-containing base‚ and a phosphate group. A pentose sugar is a five-sided sugar. Deoxyribose has a hydrogen atom attached to its #2 carbon atom (designated 2’)‚ and ribose has a hydroxyl group atom there. Deoxyribose-containing nucleotides are the monomers of DNA RNA Nucleotide [pic] The left picture shows the nucleotide unit of RNA. Nucleotides differ from nucleosides
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of mitosis? 3. Why are chromosomes not condensed during all stages of the cell cycle? 4. Sketch how DNA goes from a long stringy form to a tightly condensed form. Label the parts of the condensed‚ duplicated chromosome. 5. How does interphase prepare a cell to divide? 6. Mitosis occurs in what types of cells? 7. Develop a device‚ such as a short sentence or phrase‚ to help you remember the order of the steps of mitosis. 8. Illustrate and describe the four phases of mitosis
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chromosomes separate and each chromosome (2 chromatids) move towards opposite poles (SEGREGATION) Telophase I: - cytoplasm divides to form 2 new cells with 46 chromosomes each the nuclei may not form NOTE: the cells are not identical Meiosis II Interphase II: no doubling of DNA‚ it is just the time between meiosis I/II Prophase II: - spindle fibres forming Metaphase II: - chromosomes (2 chromatids) line up on the equator Anaphase II: - chromatids separate‚ each one moves to opposite pole
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The nucleolus (plural nucleoli) is a non-membrane bound structure. Composed of proteins and nucleic acids found within the nucleus. Ribosomal RNA (rRNA) is transcribed and assembled within the nucleolus. Three major components of the nucleolus are recognized: the fibrillar centers (FC)‚ the dense fibrillar components (DFC)‚ and granular components (GC). The DFC consists of newly transcribed rRNA bound to ribosomal proteins‚ while the GC‚ contains rRNA bound to ribosomal proteins that are beginning
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Nuclei at different stages 1. most vesicular nucleus‚ at interphase 2. Undergoing APOPTOSISnotice blebbing 3. Intermediate condensed nucleus 4. Less condensed nucleus 5. Anaphase 6. MOST CONDENSED Condensed/Hyperchromatic Nuclei: heterochromatin predominates low metabolic rate‚ low activity‚ http://studydroid.com/printerFriendlyViewPack.php?packId=62003 http://www.wadsworth.org/chemheme/heme/microscope/lymphocytes.htm Vesicular Nuclei: euchromatin predominates; indicates high
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Physiology Linder Unit 1 Possible Essay Questions Chapter 1 1. Describe the concept of homeostasis. Explain how negative feedback and positive feedback loops effect the homeostatic condition. Use examples to explain your answer. Homeostasis can be described as maintaining a relatively internal environment even though the external environment is variable. Negative feedback loops effect the homeostatic condition by controlling it by bringing you back to your set point
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