Chromatids

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Sister chromatids are 2 identical strands of DNA, held together at the centromere after being copied in the S-Phase of the Cell cycle [1]. During mitosis chromatids separate, each entering identical daughter cells.

Sister Chromatid

Image 1: An image of sister chromatids[2]

Dyad

A dyad [3] is a sister pair of chromatids. These are generated in prophase 1 of meiosis. The two sisters line up side by side and share a centromere.

References

  1. Alberts et al. (2008) The Molecular Biology Of The Cell, 5th edition, New York:Garland Science.
  2. “Sister Chromatid/ Chromosome Confusion...?” Yahoo! Answers, Yahoo!, 2000, answers.yahoo.com/question/index?qid=20110316132406AABhgVk.
  3. Alberts et al, (2008) Molecular Biology of the Cell. 5th edition. New York, Garland Science


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