Plant in which chromosomal basis of sex determination was discovered first is?

Rumex

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Melandrium

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Coccinia

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Sphaerocarpus

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Solution

The correct option is C Melandrium
Melandrium album shows sex chromosomal sex determination. They have X and Y sex chromosomal constitution similar to Drosophila and Human. However, the mechanism of sex determination is quite different from the usual XX — XY system. In Melandrium album, the AAXX individuals will be females and AAXY individuals will be males.

So, the correct answer is 'Melandrium'.

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