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Helloo22 Essay

  • Submitted by: draggerr
  • on February 20, 2014
  • Category: English
  • Length: 336 words

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Below is an essay on "Helloo22" from Anti Essays, your source for research papers, essays, and term paper examples.

Interphase I and II- The DNA consisted within the chromosomes undergo DNA replication so when the chromosomes are first seen, they have sister chromatids, this process is also followed by meiosis II.

Prophase I- DNA condensation occurs, the nuclear envelope and nucleoli disappear, and the spindle starts to form.  The big difference is what is going on with the chromosomes themselves. As DNA condensation proceeds and the chromosomes first become visible, they are visible as tetrads.  So, tetrads become visible during prophase.
Metaphase I- Tetrads line up at the equator.  The spindle has completely formed. It is during very late of prophase I and metaphase I that genetic recombination is occurring. Chiasma or chiasmata is formed and that particular part of the chromosome gets swapped with each other.
Anaphase I- Tetrads pulled apart by the spindle fibre from the centromere and chromosomes with two chromatids move toward the poles.
Telophase I- Chromosomes with two chromatids decondense and a nuclear envelope reforms around them, also known as cytokinesis. Each nucleus is now haploid. Keep in mind that it is not the number of chromatids per chromosome that determine whether a cell is diploid or haploid, but, it is the number of chromosomes and whether they are paired that determines this.

Meiosis II
Prophase II- Chromosomes with sister chromatids become visible as they condense and the nuclear envelope and nucleoli disappear, and the spindle is forming.
Metaphase II- Chromosomes with sister chromatids line up at the equator.  The spindle is fully formed. Although genetic recombination primarily occurs during meiosis I, the way the chromosomes line up during metaphase II can also help to make unique daughter cells. 
Anaphase II- Chromosomes split, so that a chromosome with only one chromatid heads toward each pole.
Telophase II- Chromosomes with only one chromatid decondense and get surrounded by new nuclear envelopes, also known as cytokinesis.  The...

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  • Submitted by: draggerr
  • on February 20, 2014
  • Category: English
  • Length: 336 words
  • Views: 82
  • Popularity Rank: 540937
  • 1 rating(s)

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