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This question already has an answer here:

Male Drosophila shows complete linkage. Is it observed for all four chromosomes or only the Y chromosome?

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marked as duplicate by AliceD, James, rg255, March Ho, kmm Mar 6 '16 at 16:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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All chromosomes. There is no crossing over in males in Drosophila. Check out the related question Why doesn't recombination occur in male Drosophila? for sources and context.

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  • $\begingroup$ Hi @Christiaan, could you clarify your comment? I thought the OP was asking if the complete linkage in male Drosophila was for all chromosomes or just the Y, to which the answer is "all". $\endgroup$ – Daniel Weissman Mar 2 '16 at 20:54
  • $\begingroup$ I don't question the validity of the answer, but the norm at Bio is to elaborate on your answer. For example, where did you obtain your answer from (references, sources)? Why is it all the chromosomes and not one? How do you know? As of now, it's a one-liner and this is generally not suitable as an answer, but more as a comment. $\endgroup$ – AliceD Mar 2 '16 at 21:20
  • $\begingroup$ +1. However, it makes me wonder if this question is a dupe from your linked post? $\endgroup$ – AliceD Mar 2 '16 at 22:12
  • $\begingroup$ Probably? Not sure how these things work. $\endgroup$ – Daniel Weissman Mar 3 '16 at 14:53

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