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Posted by on Saturday, November 28, 2009 at 8:38pm.

When do strands of DNA form chromoshomes?
What is a replicated chromosome? How does this differ from a chromosome pair? Is a cell containing replicated chromosomes haploid, diploid, or neither? Why? and Why is anaphase unique in terms of chromosome number?

  • biology - , Saturday, November 28, 2009 at 10:36pm

    When does DNA replication take place in the cell cycle?
    In the middle of the interphase, and the period when it is occurring is called the S phase (Campbell, Simon, Reece, & Dickey, 1946-2004, p.125).
    When do strands of DNA form chromoshomes?
    During the S phase also.
    What is a replicated chromosome? How does it differ from a chromosome pair?
    Replicated chromosomes are chromosomes that continously replicate. Like your skin cells or the lining in your stomach that help food dissolve. The chromosome pairs differ because they are identical chromosomes, each of which consists of two identical sister chromatids after chromosome duplication (Campbell, Simon, Reece, & Dickey, 1946-2004, p131).
    Is a cell containing replicated chromosomes haploid, diploid, or neither? Why?
    Humans are considered diploid organisms because all body cells contain pairs of homologous chromosomes. A cell with a single chromosome set is called a haploid cell; it has only one member fo each homologous pair. So I guess a replicated chromosome is neither haploid or diploid, because homologous chromosomes are considered a pair not a replicated one.
    Why is anaphase unique in terms of chromosome numbers?
    Because in this anaphase the homologous chromosomes split up in contrast to mitosis where the sister chromatids migrate as a pair.

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