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

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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". $\endgroup$ Commented Mar 2, 2016 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
    Commented Mar 2, 2016 at 21:20
  • $\begingroup$ +1. However, it makes me wonder if this question is a dupe from your linked post? $\endgroup$
    – AliceD
    Commented Mar 2, 2016 at 22:12
  • $\begingroup$ Probably? Not sure how these things work. $\endgroup$ Commented Mar 3, 2016 at 14:53

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