The biology
Yeast has three cell types — haploid a, haploid α, and diploid a/α. A haploid cell carries both a and α information but expresses only one, and can switch by copying a silent stored cassette into the active MAT slot. A small set of regulators — a1, α1, α2 — acts combinatorially to specify the three states.
An address that carries all and reads one
This is a loaded address: the cell holds the whole coordinate — both identities — but expresses only the one in the active slot, and can rewrite that slot from its silent store. Identity is not fixed in the sequence but selected from it, and a handful of regulators reading in combination pick which state the cell is in. The regulator that does this is kin to the homeobox that lays out an animal body (Paper 17) — the same combinatorial address-reading, one register down.
Where this departs from current science
| Current science says | The Force of Time says |
|---|---|
| Mating-type switching is cassette gene conversion. | It is a loaded address — the cell carries all, reads one, and rewrites the active slot from its store. |
| a1/α1/α2 form a combinatorial regulatory logic. | They are combinatorial address-reading, kin to the homeobox one register up. |
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This paper, and any information drawn from it, may be used freely provided the reference attribution to Stephen Daubney and The Daubney Foundation is recognised.