(A) The sex determination mechanism in the plant $Melandrium$ $album$ (also known as $Silene$ $latifolia$) was discovered by $H. E. Warmke$ in $1946$.

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(A) The sex determination mechanism in the plant $Melandrium$ $album$ (also known as $Silene$ $latifolia$) was discovered by $H. E. Warmke$ in $1946$. He demonstrated that the $Y$ chromosome in this species carries male-determining factors,making it a classic model for studying sex determination in dioecious plants.