Meiosis (1)

Meiosis (1) - reform. Chromosome number in 2 new cells is...

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Reviewing Mitosis Comparing Plant & Animal Cells
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Animal vs. Plant Mitosis Animal Cells Have centrioles! Cytokinesis simple pinching of cell membranes Plant Cells No centrioles Equatorial plate Cytokinesis must form 2 membranes PLUS 2 cell walls
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Meiosis Formation of Gametes
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Definitions Gamete Sperm Ovum (plural ova) Testes Ovaries Zygote Fertilization Haploid Diploid
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Meiosis Two nuclear divisions Creates haploid gametes In animals, sperm and ova In plants, spores Crossing Over occurs 4 daughter cells are created.
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Meiosis Leads to Genetic Recombination!!!
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Meiosis I: Separation of Homologues Prophase I Chromosomes Condense Nuclear Envelope Disappears Spindle Formed (Asters seen here) Homologues Pair Up Crossing-over occurs here Crossing-over occurs here!
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Metaphase I Homologous chromosomes move to equator
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Anaphase I Homologues separate Chromatids do not separate from centromeres!
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Telophase I Nuclear envelope usually does not
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Unformatted text preview: reform. Chromosome number in 2 new cells is now half because chromatids did not separate. THIS IS REDUCTION DIVISION! Cytokinesis may or may not occur. Meiosis II No replication of chromosomes!!!! Proceeds just like mitosis Starts and ends with haploid cells Ovum Formation Meiotic stages are the same One daughter cell keeps ALL of the cytoplasm Other 3 daughter cells only have genetic material Polar Bodies (Barr Bodies) Sperm Formation Cytoplasm and Nuclear Material Divides evenly. Flagella are added last to the cells following differentiation Define differentiation in your notes here. Draw a sperm and egg uniting to form a zygote. Be sure to include the number of chromosomes for each. Using 2 different colored pencils, draw two homologous chromosomes before and after they cross over....
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This note was uploaded on 11/09/2011 for the course BIO 110 taught by Professor Harmon during the Winter '11 term at BYU.

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Meiosis (1) - reform. Chromosome number in 2 new cells is...

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