(D) The $TDF$ stands for $Testis-Determining$ $Factor$. It is a gene located on the $Y$ chromosome,specifically in the $SRY$ ($Sex-determining$ $Regio

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Gene present on the $Y$ chromosome

(D) The $TDF$ stands for $Testis-Determining$ $Factor$. It is a gene located on the $Y$ chromosome,specifically in the $SRY$ ($Sex-determining$ $Region$ $Y$) region. This gene is responsible for the initiation of male sex determination in mammals by triggering the development of testes from the undifferentiated gonads.