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Ch13-Meiosis - Chapter 13 Meiosis Meiosis Introduction to...

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Chapter 13 Meiosis
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Meiosis Introduction to Heredity Role of Meiosis in Sexual Life Cycles Origins of Genetic Variation
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Heredity and Variation Transmission of traits from one generation to the next Offspring differ somewhat from parents
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Inheritance Parents pass on traits to their offspring in the form of genes on chromosomes genes, as segments of DNA, program specific traits genetic information is coded as the specific sequence of nucleotides in DNA program cells to synthesize specific proteins and enzymes
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Inheritance Each species has a characteristic number of chromosomes Humans 46 chromosomes (23 pair) Inheritance of chromosomes by offspring from their parents differs depending on the type of reproduction
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Reproduction Asexual Reproduction offspring inherits all of its genes (DNA, chromosomes) from a single parent Sexual Reproduction offspring inherits genetic material from two parents (1/2 from each)
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“Like begets like” Reproduction by budding or mitotic cell division -unicellular eukaryotes -some multicellular eukaryotes Fig 13.2 Asexual reproduction of a hydra
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Sexual Reproduction Two parents required to produce an offspring Offspring receives half of its genetic material from each parent Greater genetic variation
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Sexual Reproduction Two parents give rise to offspring unique combinations of genes inherited
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