You must be able to narrate the steps of mitosis reasonably well going into the MCAT. The exam often poses questions on the events associated with different stages. Look out for the subtleties and possible confusions.

In prophase, the chromosomes condense, appearing as two identical chromatids connected at the centromere. The DNA has already been duplicated, so the chromosome at this stage contains two identical copies, two copies within each chromosome (not two chromosomes, but two chromatids). After the chromosomes split, later in metaphase, the individual copies can then separately be known as chromosomes.

One favorite set of MCAT facts to remember is that the nucleolus disappears during prophase, and that the end of prophase is marked by the breakdown of the nuclear envelope, which allows the microtubules of the centioles at opposite ends of the cell to reach the centromeres of the chromosomes.












The WikiPremed MCAT Course is a comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum. Please read our policies on Privacy and Shipping & Returns.  Contact Us. MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. WikiPremed offers the customers of our publications or our teaching services no guarantees regarding eventual performance on the MCAT.


Creative Commons License
WikiPremed is a trademark of Wisebridge Learning Systems LLC. The work of WikiPremed is published under a Creative Commons Attribution NonCommercial ShareAlike License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions.