The phrase "ancestral system" is correct and usable in written English.
It can be used to refer to a system or structure that is derived from or related to ancestors, often in contexts discussing heritage, lineage, or traditional practices.
Example: "The ancestral system of governance in the tribe has been passed down through generations, influencing their current leadership structure."
Alternatives: "heritage system" or "lineage framework".
Today the complete array of consonants is found preserved among certain of the Modern South Arabian (MSA) languages (of the Southwest Semitic group); with the exception of the Southwest Semitic or Arabic f, which developed from the proto-Semitic *p, the more conservative MSA languages quite faithfully recapitulate the presumed phonetics of the Semitic ancestral system.
A new theoretical analysis now demonstrates that hybrid-zone dynamics provide a counterintuitive explanation for how a new chromosomal sex-determination system can evolve and spread across the landscape, displacing the ancestral system, even though it would be eliminated by natural selection in a single isolated population.
Phylogenetic analysis suggests that the TFSSs have evolved from a common ancestral system with virtually no shuffling of constituents even between sequence-divergent systems.
The alternative interpretation posed was that the condition in N. scintillans was a derived state in this lineage: "The ancestral system may have had two genes, which fused in Noctiluca".
Biological systems can share a common mechanism either because of descent from a common ancestral system or molecule (termed homology), or because of convergent evolution of two unrelated systems or molecules (termed analogy).
We assume that the ancestral system is controlled by polymorphism at a single sex-determining locus.
Although many studies stress the distinctive aspects of human language abilities, others argue that its foundations stem from a complex reconfiguration of ancestral systems that are shared with other species.
"The piece was a way to reaffirm powerful and ancestral systems".
When our fancy new deliberative reasoning systems evolved, evolution, which lacks foresight, took what amounts to the lazy way out, crudely grafting the new capabilities onto the older ancestral systems, with nary a thought as to how the two would work together.
Freud, wrong about so much else, was certainly right that the mind is forever locked in internal conflict; where he talked about "id" and "ego", modern scholars see something slightly different, a clash between "ancestral systems" and more modern "deliberative cognition", but for present purposes the point is much the same.
Such work suggests that ancestral systems may not have been as tightly constrained as they are today.
