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educator.com

Diploid cells have two sets of chromosomes. Somatic (non-reproductive) cells are diploids and reproduce via mitosis. Haploid cells only have one set of chromosomes and are reproductive (gametes or sperm and egg cells). These cells reproduce via meiosis. Humans have 46 chromosomes in diploid/somatic cells (2 sets of 23). Meiosis has two rounds, meiosis 1 and meiosis 2, that each include the steps prophase (1 or 2), metaphase (1 or 2), anaphase (1 or 2), and telophase (1 or 2). These two phases result in four non-identical haploid daughter cells. In prophase 1, homologous chromosomes pair up and portions of DNA “cross over.” This creates different combinations of alleles and increases genetic diversity. Many of the following steps are the same as mitosis, but in the second stage, there is an additional swapping step to allow for further variation. Haploid and Diploid Cells. Diploid and Somatic Cells. Haploid and Gametes. Sex Chromosomes. Comparison of Mitosis and Meiosis. Mitosis Vs. Meiosis: Cell Division. Mitosis Vs. Meiosis: Daughter Cells. Meiosis: Pairing of Homologous Chromosomes. Mitosis and Meiosis. Process of Mitosis. Process of Meiosis. Synapsis and Crossing Over. Prophase I: Synapsis and Crossing Over. Chiasmata. Meiosis I. Prophase I: Crossing Over. Metaphase I: Homologs Line Up. Anaphase I: Homologs Separate. Telophase I and Cytokinesis. Independent Assortment. Meiosis II. Propphase II. Metaphase II. Anaphase II. Telophase II. Cytokinesis. Cell Division Mechanism in Plants.

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les éditions génération 5 proposent des ressources pédagogiques et du matériel numérique scolaire pour l'école, le collège et le lycée.