Chapter 9 spring 2011 - Chapter 9 Cell Reproduction...

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Chapter 9 Cell Reproduction Cell Reproduction
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Different Kinds of Cell Division Different Kinds of Cell Division Binary Fission = Cell division in prokaryotic prokaryotic cells Mitosis = Cell division in somatic ( non-sex non-sex ) eukaryotic cells Meiosis = Cell division in eukaryotic sex cells ( gametes gametes ); egg & sperm
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Sexual Versus Asexual  Reproduction Sexual Reproduction – When offspring are produced by the fusion of gametes (sperm & egg) from two adults Gametes are made through meiosis Cells are genetically unique Asexual Reproduction – reproduction in which offspring are formed from a single parent , without having a sperm fertilize an egg Offspring are produced through mitosis Offspring are genetically identical to the parent cell
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Prokaryotic Binary Fission Cell reproduction of prokaryotic cells like bacteria that produces two two genetically identical genetically identical daughter cells by division division (fission). Before cell division, DNA replicates replicates . The two chromosomes (circular) or nucleoid are attached inside the plasma plasma membrane membrane .
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Following DNA replication, the two chromosomes move apart as a cell lengthens. When cell is approximately twice twice its original length, the plasma membrane plasma membrane grows inward, and a new cell wall cell wall forms dividing the cell into two approximately equal daughter cells.
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Mitosis For growth growth , development development , repair repair and maintenance. It is involved in the development of a fertilized fertilized egg egg into a multicellular multicellular organism organism .
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Chromosome Number in Mitosis This nuclear division leaves the chromosome number constant constant . A parent cell yields two two genetically identical genetically identical daughter cells daughter cells with the same number of chromosomes.
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When cell is not undergoing division, DNA in the nucleus is a tangled mass of threads called chromatin chromatin (not visible with a light microscope). At cell division, chromatin becomes highly coiled and condensed and is now visible as chromosomes chromosomes . The DNA wraps itself around histone proteins.
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Chapter 9 spring 2011 - Chapter 9 Cell Reproduction...

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