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(A) The correct answer is $A$. The chromosomal basis of sex determination was first discovered in the plant $Melandrium$ (also known as $Lychnis$ $dio

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Melandrium $(Lychnis)$

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(A) The correct answer is $A$. The chromosomal basis of sex determination was first discovered in the plant $Melandrium$ (also known as $Lychnis$ $dioica$). In this plant,sex is determined by the presence or absence of the $Y$-chromosome. Individuals possessing a $Y$-chromosome are male,while those lacking it are female.

The first plant in which the chromosomal basis of sex determination was discovered is

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