DNA Structure and Replication

ID #2231

So in a typical mitotic chromosome, the number of chromosome arms equals the number of telomeres, correct? Or would it be sister chromatids? Or is it neither of those?

Yes. Let's look at each of the features you mentioned. 

The telomere is the end of a linear chromosome. Therefore, each chromosome will have two telomeres, one at each end. (The region around the telomere is called the telomeric region and is labeled with a red arrow on the mitotic chromosome slide from lecture 14.) 

Each mitotic chromosome contains two sister chromatids, which are identical copies of the same chromosome. Each of those chromosomes will have 2 telomeres. 

So: 2 sister chromatids, each with 2 telomeres = 4 telomeres in a mitotic chromosome. And, as you can see on one of the slides from lecture 14, there are four arms on a mitotic chromosome. 

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