D12152-Chapter_13

D12152-Chapter_13 - Chapter 13 Meiosis and Sexual Life...

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Chapter 13 Meiosis and Sexual Life Cycles
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Question? Does Like really beget Like? The offspring will “resemble” the parents, but they may not be “exactly” like them.
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Can you pick out the kids for each couple?
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Heredity The transmission of traits from parents to offspring. Comment - Humans have been aware of heredity for thousands of years.
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Genetics The scientific study of heredity. Comment - Genetics is only about 150 years old.
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Genes The DNA for a trait. Locus - the physical location of a gene in a chromosome.
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Reproduction A method of copying genes to pass them on to offspring. Two main types: Asexual reproduction Sexual reproduction
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Asexual Reproduction Parent passes all of its genes to its offspring. Uses mitosis. Also known as cloning. Comment - many organisms reproduce this way.
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Asexual Bud
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Advantages Only need 1 parent. Offspring are identical to the parent. Good genetic traits are conserved and reproduced.
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Disadvantages No new DNA combinations for evolution to work on. Clones may become extinct if attacked by a disease or pest.
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Sexual Reproduction Two parents contribute DNA to an offspring. Comment - most organisms reproduce this way, but it hasn’t been proven in some fungi and a few others.
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Advantages Offspring has a unique combination of DNA which may be an improvement over both parents. New combination of DNA for evolution to work with.
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Need two parents. Good gene combinations can be lost. Offspring may not be an
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This note was uploaded on 04/29/2009 for the course BIOL 213 taught by Professor Dalmet during the Spring '07 term at George Mason.

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D12152-Chapter_13 - Chapter 13 Meiosis and Sexual Life...

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