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Please explain karyotyping.1) why can karyotyping, be carried out only on cells about...

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stsf | Student, Grade 11 | eNoter

Posted October 26, 2010 at 9:17 PM via web

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Please explain karyotyping.

1) why can karyotyping, be carried out only on cells about to devide?

2) why do cells devide? Do all cells undergo devision? explain.

3) how can karyotyping determine if the cell is from a male or a female.

4) what needs to be done to the cells that are about to devide before they can be viewed and photographed.

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trophyhunter1 | College Teacher | (Level 3) Senior Educator

Posted October 27, 2010 at 7:33 AM (Answer #1)

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Karyotyping is carried out on cells during the process of Mitotic cell division. During this time in a cell's life cycle, the chromosomes are coiled and thickened. They must be arrested during cell division with colchichine. They can be visualized and stained and microphotographed. They are then arranged by size and by position of their centromeres in a karyotype chart.  The first 22 pairs of chromosomes are the autosomes. The 23rd pair, is called the sex chromosome pair. A male child would have one X and one Y chromosome, and a female child would have two X chromosomes. Cells divide for many reasons, including to replace old or worn out cells, for growth and for reproduction purposes in unicellular organisms.

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