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(C) The initial clues regarding the genetic or chromosomal basis of sex determination were provided by the experiments conducted on insects. In $1891$

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Insects

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(C) The initial clues regarding the genetic or chromosomal basis of sex determination were provided by the experiments conducted on insects. In $1891$,Henking observed a specific nuclear structure during spermatogenesis in a few insects,which he termed the $X$-body. Later,it was discovered that this $X$-body was actually a chromosome,now known as the $X$-chromosome.

Initial clues about the genetic/chromosomal mechanism of sex determination can be traced back to some of the experiments carried out in:

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