One of the first steps in obtaining a karyotype (such as that shown below of a cancer cell) is treating cells with a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?

A. Only mitotic chromosome DNA is separated into single strands, allowing for staining by dyes.
B. Only in mitosis are homologous chromosomes paired up.
C. Only mitotic chromosomes are highly condensed and visible with a light microscope.
D. Only mitotic cells contain homologous chromosomes, because mitosis happens after DNA replication.


Ans: C. Only mitotic chromosomes are highly condensed and visible with a light microscope.

Biology & Microbiology

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Fill in the blank(s) with correct word

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Is the genetic code the same in all living organisms?

What will be an ideal response?

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