Final answer:
The combination of male (or female) parenchymal and stromal reproductive tissue refers to the development of either male or female reproductive organs from bipotential embryonic tissues, influenced by the presence or absence of testosterone.
Step-by-step explanation:
The term you're asking about refers to the combination of parenchymal (functional) and stromal (supportive) reproductive tissue within the male or female reproductive systems. During embryonic development, reproductive tissues are initially bipotential, meaning they have the potential to develop into either male or female structures. However, as development progresses, the presence of hormones such as testosterone influences these tissues to differentiate into male reproductive organs, while the absence of testosterone leads to the development of female reproductive organs.
For proper reproductive function in the adult, one set of these ducts must develop correctly while the other degenerates. In males, for example, testosterone stimulates the development of the Wolffian duct into the epididymis, ductus deferens, and seminal vesicles, whereas the absence of testosterone and sustentacular cell secretion would lead to the development of the female tract from the Müllerian duct.