Copy of Notes: Chapter 6.2 Process of Meiosis.docx

Copy of Notes: Chapter 6.2 Process of Meiosis.docx - 6.2...

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6.2 Process of Meiosis Notes Mrs Rana Fatima Key Concept: Diploid cells undergo two cell divisions that result in haploid cells. Meiosis begins with a diploid cell that has undergone DNA replication. The cell copies the chromosomes once and divides them twice, making four haploid cells. Main Idea 1: Cells undergo through two rounds of division in meiosis. Meiosis is a nuclear division creates 4 haploid cells from one diploid cell. Included 2 rounds of cell division. Meiosis I (4 phases) Meiosis II (4 phases) Meiosis reduces chromosome number and creates genetic diversity. Homologous chromosomes and Sister Chromatids Homologous chromosomes Sister Chromatids Homologous chromosomes are two separate chromosomes one from mother and one from the father. same in length and carry the same genes but not copies of each other They are divided in meiosis I. Each half of duplicated chromosome is Chromatid Together the 2 chromatids are called sister chromatids. Sister Chromatids are duplicated chromosomes remain attached by centromere. Sister chromatids are not divided until Meiosis II Meiosis I: Before Meiosis begins DNA has already been copied Meiosis I divides homologous chromosomes, producing two haploid cells with duplicated chromosomes. Scientists describe meiosis in terms of phases. 1. Prophase I Early in meiosis, the nuclear membrane breaks down, The centrosomes and centrioles move to opposite sides of the cell, and spindle fibers start to assemble.
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  • Spring '19
  • Mitosis, meiosis II, diploid cells

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