How to deal with advisor writing a thesis chapter for you? How would you respond if an advisor writes a chapter of your thesis for you and asks you to rewrite what they wrote? Something seems wrong but I can't pinpoint it. It seems like a grey area. What are the potential plagiarism implications if I do this? And how can a student rewrite it any better than what someone with so much experience has written?
What would be an ethical and courteous way to respond? If there are any other sources or places you think I might be able to find more information or help from about this, I would like to hear that too.
A few possible reasons:

The advisor is not very experienced with advising students and is not clear on what they are supposed to do.
The advisor intends to publish the thesis with the student and is therefore interested in ensuring that the specific chapter is properly written.
The advisor is not confident in the student’s ability to correctly formulate certain ideas.

What can the student do? Ask the advisor politely to lead the writing of the thesis, write a first draft that they can later review. If the advisor insists, I suggest letting it go. It’s one chapter and is not a very big deal if it is indeed an undergraduate thesis. Helping students write is not unethical unless the student is really not leading the project. However in that case I fail to see why the advisor would take the thesis writing as their own project...