Quote:
Originally Posted by frogsleap farm
It is exceedingly rare to get simultaneous and identical mutations on both chromosomes. Dominant mutations are due to a mutant hyperactive allele masking the wild type allele
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Thanks, another good point I missed. So, a red-to-yellow fruit mutation would require (except in extremely lucky cases) that the original red was heterozygous (Rr) for fruit color and not a stable specimen to begin with.