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Yes, a regression would be reverting to an earlier form. Landrace wheats (traditional, locally adapted) were used to develop the hybrid dwarf wheat.
Partially accurate. The reality is that a Japanese dwarf wheat, likely introduced from Korea, was crossed with a high-yielding American variety to produce a semi-dwarf wheat, Norin 10.
| You said | The truth is |
| "Landrace wheats ..." | "A Japanese dwarf wheat ..." |
| "... (traditional, locally adapted) ..." | "... likely introduced from Korea ..." |
| "... were used to develop the hybrid ..." | "... was crossed with a high-yielding American variety to produce ..." |
| "... dwarf wheat." | "... a semi-dwarf wheat, Norin 10." |
RhT 1b in dwarf wheat could be recessive.
No, it can't. The dwarfing allele Rht-B1b is semi-dominant—even one copy produces an intermediate height reduction (because the DELLA protein interferes with GA signaling in a dosage-dependent way):
- Rht-B1a—Rht-B1a = tall
- Rht-B1a—Rht-B1b = semi-dwarf
- Rht-B1b—Rht-B1b = fully dwarf
Dwarf wheat could also be genetically modified ...
It could be, yes—like any crop could be, using today's biotech tools. But that's a hypothetical, not the historical reality.
... as chemical and irradiation manipulation of genes were widely experimental in the 1920's and 1930's.
The timeline of mutagenesis technology and the breeding history of Norin 10 simply don't overlap in the way you're implying.
There were initial experiments in the 1920s and 1930s (with X-rays, not gamma rays), and these were research tools, not widespread agricultural breeding programs. Cobalt-60 wasn't even discovered (by nuclear reaction) until 1934, and gamma-ray facilities for agriculture came much later.
Again, Norin 10 was first produced in 1925, being registered and released 10 years later. It was preceded by Fultz-Daruma (1917), and Shiro-Daruma (1904)—the Rht-B1b mutation existing in all these lines way before mutagenesis technologies developed beyond the laboratory.
Mutation is mistake.
God doesn't make mistakes. In his providence God governs all natural processes, including mutations and even things we consider "random" (Prov. 16:33; Matt. 10:29–30).
Mutations are just changes (in the nucleotide sequence of DNA), and not all changes are bad. Even in a fallen world, grace allows for variation that is useful and life-sustaining—like the dwarfing mutation in wheat that has fed untold millions.
(I would go so far as to say, theologically speaking, no change is bad.)
If, as you assert, RhT 1b is a mistake in recombination of genetic material specific to wheat, ...
Totally not what I said at all.
I said Rht-B1b is a specific nucleotide substitution (mutation)—namely, a "C" to "T" substitution at codon 383, converting a glutamine codon (CAA) into a stop codon (TAA), which produced a truncated protein that cannot bind gibberellins properly, making the plant gibberellin-insensitive. That resulted in a crop that has fed untold millions.
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