Meiosis: Crossing Over and Synapsis
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Questions and Answers

During prophase I, what holds the homologs together tightly?

  • Centromere
  • Cohesins
  • Synaptonemal complex (correct)
  • Chiasmata
  • What is the result of crossing over during prophase I?

  • Cells with an increased number of chromosomes
  • Cells that differ genetically from each other and from the parent cell (correct)
  • Cells with a reduced number of chromosomes
  • Genetically identical cells
  • During which stage of meiosis do homologous pairs line up at the metaphase plate?

  • Telophase I
  • Metaphase II
  • Anaphase I
  • Metaphase I (correct)
  • What is the purpose of cohesins during meiosis?

    <p>To hold sister chromatids together</p> Signup and view all the answers

    What is unique to meiosis I?

    <p>Synapsis and crossing over in prophase I</p> Signup and view all the answers

    What is the end result of meiosis?

    <p>Four cells that differ genetically from each other and from the parent cell</p> Signup and view all the answers

    What is the number of combinations possible when chromosomes assort independently into gametes?

    <p>2n, where n is the haploid number</p> Signup and view all the answers

    During which stage of meiosis do chromosomes line up at the metaphase plate?

    <p>Metaphase II</p> Signup and view all the answers

    What is the result of crossing over during meiosis?

    <p>Recombinant chromosomes that combine DNA from two parents</p> Signup and view all the answers

    During which stage of meiosis do sister chromatids separate?

    <p>Anaphase II</p> Signup and view all the answers

    What is the process by which homologous chromosomes pair up during meiosis?

    <p>Synapsis</p> Signup and view all the answers

    On average, how many crossover events occur per chromosome during meiosis?

    <p>One to three crossover events</p> Signup and view all the answers

    What occurs during synapsis?

    <p>Nonsister chromatids are held together</p> Signup and view all the answers

    What is the result of crossing over during prophase I?

    <p>Genetic variation increases</p> Signup and view all the answers

    What occurs during anaphase I?

    <p>Homologous pairs move to opposite poles</p> Signup and view all the answers

    What is the result of random fertilization?

    <p>Each zygote has a unique genetic identity</p> Signup and view all the answers

    What occurs during prophase I that increases genetic variation?

    <p>Synapsis and crossing over</p> Signup and view all the answers

    What is the approximate number of diploid combinations possible from independent assortment during meiosis?

    <p>70 trillion</p> Signup and view all the answers

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