章节大纲

  • 常规

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  • 有丝分裂与减数分裂

    A diagram showing a cell in the process of mitosis with two nuclei.

     

     or  ?
    ::还是?

    This represents a tiny  embryo  just beginning to form. Once an  egg  is fertilized, the resulting single  cell  must divide many, many times to develop a  fetus . Both mitosis and meiosis involve  ; is this type of cell division an example of mitosis or meiosis? The answer is mitosis. With each division you are making a genetically exact copy of the  parent cell , which only happens through mitosis.
    ::这是刚开始形成的微小胚胎。 一旦卵子被施肥, 由此产生的单细胞必须进行很多次分离才能形成胎儿。 肾上腺素和肾上腺素都包含: 这种细胞分裂是否是肾上腺素或肾上腺素的范例? 答案是肾上腺素。 您正在用每一个细胞来做一个父细胞的基因精确复制件, 而这只能通过肾上腺素来发生 。

    Mitosis vs. Meiosis
    ::Mitispis vs. Meisisi vs. Meisis( 缩缩缩图)

    Comparison of binary fission, mitosis, and meiosis stages in cell division.

     

    A comparison between binary fission, mitosis, and meiosis.
    ::二进制裂变、分裂症和肾上腺素的比较。

      Mitosis Meiosis
    Purpose To produce new cells To produce  gametes
    Number of Cells Produced 2 4
    Rounds of Cell Division 1 2
    Haploid  or  Diploid Diploid Haploid
    Daughter cells  identical to parent cells? Yes No
    Daughter cells identical to each other? Yes No

    Summary
    ::摘要

    • The goal of mitosis is to produce a new cell that is identical to the parent cell.
      ::分裂的目的是产生与母细胞相同的新细胞。
    • The goal of meiosis is to produce gametes that have half the DNA of the parent cell.
      ::肾上腺素综合症的目标是产生具有母细胞DNA一半的数子。

    Explore More
    ::探索更多

    Use the resources below to answer the questions that follow.
    ::利用以下资源回答以下问题。

    Explore More I
    ::探索更多

    • Mitosis and Meiosis Simulation  at   (11:53)
      ::模拟时(11:53)
    1. What are homologous chromosomes?
      ::什么是同族染色体?
    1. How do the location of specific genes compare between homologous chromosomes?
      ::具体基因的位置如何比较同族染色体?
    1. What is the outcome from mitosis?
      ::精神分裂的结果是什么?
    1. What is a tetrad? Why are they an important feature of meiosis?
      ::什么是四胞胎?为什么它们是一个重要的 结膜病特征呢?
    1. How does meiosis differ between females and males?
      ::女性和男性的心智状况如何不同?

    Explore More II
    ::探索更多情况二

    • How Cells Divide  at 
      ::单元格如何分隔
    1. How many daughter cells arise from mitosis? How many daughter cells are produced in meiosis?
      ::有多少个女儿细胞是由分裂引起的?有多少个女儿细胞是由分裂产生的?有多少个女儿细胞是由分裂产生的?
    1. How does the attachment of spindle fibers differ between mitosis and meiosis I?
      ::脊椎纤维的依附在脊髓硬化和脊髓硬化I之间有何区别?
    1. Is anaphase I or anaphase II in meiosis more analogous to anaphase in mitosis? Explain your reasoning.
      ::肺部硬化的第一阶段或第二阶段是否更类似于脑部硬化的阶段?解释一下你的推理。
    1. How many steps are there in mitosis? How many steps are there in meiosis?
      ::脊髓灰质疏松有几步?
    1. How does interphase I of meiosis differ from interphase II of meiosis?
      ::诊断的第一阶段与第二阶段的第二阶段有什么不同?

    Review
    ::回顾

    1. What is the goal of mitosis? Of meiosis?
      ::精神分裂的目标是什么?
    1. How many cells are created from cytokinesis following mitosis? Following meiosis?
      ::有多少细胞是由分裂症后的细胞基质生成的? 有多少细胞是由分裂症后的细胞基质生成的? 有多少细胞是由分裂症后的细胞基质生成的?
    1. Which process, mitosis to meiosis, creates genetically identical cells?
      ::哪个过程, 与肾上腺素的分裂, 产生基因相同的细胞?
    1. "Gametes are haploid cells." What does this sentence mean?
      ::"Gametes是杂乱无章的细胞" 这句是什么意思?