Four chromosomes have these arms, in µm…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Four chromosomes have these arms, in µm. P: and . Q: and . R: and . S: no short arm and . Name each kind of chromosome, and say where its centromere lies.
Need a reminder? The key ideaShow
The nuclear envelope has two membranes and pores. Nucleoli have no membrane and make rRNA. Chromatin is DNA, histones, non-histone proteins and RNA. The centromere sits in the middle (metacentric), a little off the middle (sub-metacentric), near one end (acrocentric) or at the end (telocentric).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. P. The arms are nearly equal, so the centromere is in the middle: metacentric.
Step 2. Q. One arm is clearly shorter, so the centromere is a little away from the middle: sub-metacentric.
Step 3. R. One arm is extremely short, so the centromere is close to one end: acrocentric.
Step 4. S. There is no short arm, so the centromere is at the end: telocentric.
Answer: P metacentric, Q sub-metacentric, R acrocentric, S telocentric.
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