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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(A = 5‚ C = 2) Mitosis 1) A cell with 10 chromosomes undergoes mitosis. Indicate how many chromosomes would be expected in each of the daughter cells. (I = 1‚ C = 2) 2) During interphase‚ what event must occur for the cell capable of undergoing future divisions? (A = 1‚ C = 2) 3) Using a dictionary (or your electronic devices)‚ look up the meaning of the prefixes used in the stages of mitosis: pro-‚ meta-‚ ana-‚ telo-. Why would they
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phosphate on cell division in root tips. Background knowledge Phosphate ions (macronutrients) are needed large amounts by plants. They are required for root growth. For the root tips cells to divide‚ mitosis has to occur. Phosphate is needed for production of ATP which provides energy for mitosis to occur. DNA replication occurs during interphase of the cell cycle. DNA is made up of nitrogen containing base‚ pentose sugar and phosphate group. The phosphate group forms part of the sugar phosphate
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parents‚ there is also opportunity for many mutations in meiosis | Mutation is a source of variation in both‚ asexual offspring are otherwise identical to parent‚ sexual offspring are genetic recombinations of parents. | Similarities of Mitosis and Meiosis
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diploid). It is during meiosis I that most of the genetic recombination occurs. Phases: Keep in mind that before meiosis begins at all‚ the DNA undergoes replication‚ just like it did before mitosis started. So‚ when you first see chromosomes in meiosis I‚ they have sister chromatids‚ just like in mitosis. It is just that in meiosis I‚ we will be talking about tetrads becoming visible‚ lining up‚ separating‚ and decondensing (rather than
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sperm. The development of mature eggs and sperm from precursor cells. Centrosome- A small region of cytoplasm adjacent to the nucleus that contains the centrioles and serves to organize microtubules. 2. How does the process of mitosis compare with meiosis? In mitosis‚ each of the two new cells (called the daughter cells) resulting from the cell division receives the same number of chromosomes that were present in the precursor cell (called the parent cell). In meiosis‚ the number of chromosomes
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resting or quiescent; G1‚ in which cells undergo RNA and protein synthesis necessary for entry in to S-phase; S-phase‚ in which cells undergo DNA replication; G2‚ in which cells undergo RNA and protein synthesis in preparation for mitosis; and M-phase‚ in which cells undergo mitosis and cytokinesis. You are studying the effects of two chemicals (T and N) towards the cell cycle progression using flow cytometer. Briefly‚ the vascular smooth muscle cells (VSMCs) were treated with T and N as stated
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1 | | | 1. Introduction | 2 | 1.1 Mitosis | 2 - 3 | 1.2 Meiosis | 4 | | | 2. Theory | 5 | 2.1 Mitosis | 6 | 2.2 Meiosis |
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Homework (6 problems) ___Ch. 8 Mitosis Introduction (FIB & diagrams) ___Ch 8 Mitosis & Meiosis (FIB) complete ___Diagram #3 Phases of Cell Cycle Pie Chart ___Diagram #9 Cytokinesis – Plant & Animal ___Diagram Meiosis #5 Metaphase & Crossing Over ___Diagram Meiosis #6 Egg & Sperm Dev’t (p 155) ___Diagram: All Stages of Cell Cycle‚ Mitosis (loose leaf) ___Diagram: Zygote Development (page 683) ___Chart Comparing Mitosis/Meiosis ___Concept Map – Comparing Mitosis & Meiosis ___4.5 Common Assessment
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There are two types of nuclear division include mitosis and meiosis. Mitotic cell division is involved in the formation of an adult organism from a fertilized egg‚ asexual reproduction‚ regeneration‚ and maintenance or repair of body parts. Mitosis typically results in new somatic‚ or body cells. Meiosis results in the formation of either gametes in animals or spores in plants. The cells formed have half the chromosome number of the parent cell. Mitosis is best observed in cells that are growing at
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