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

M e l a n d r i u m

(Lychnis)

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R u m e x

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Solution

The correct option is A $M e l a n d r i u m$ (Lychnis)
In $M e l a n d i r u m$ , the sex is determined by the Y chromosome, when Y chromosome is present, the sex is male. When Y is absent, the sex is female. $M e l a n d r i u m$ $a l b u m$ is a dioecious species showing a clear-cut correlation between the phenotypic sex and the presence of heteromorphic sex chromosomes.

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