Which of the following phenomena leads to variation in $DNA$?

  • A

    Linkage, mutation

  • B

    Recombination, linkage

  • C

    Mutation, recombination

  • D

    Aneuploidy, linkage

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Mendel published his work on inheritance of characters in $1865$ but it remained unrecognised till $1900$ because

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$(d)$ Communication was not easy (as it is now)

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  • [AIPMT 2005]