Lowest occurance of phenotype expression is 5% as a general rule.
Meaning out of 20 seeds you have seen every phenotype expression(excluding the rare occurrence, for example cherry AK47 by serious seeds 1/100,000)
But, the pheno you want could be a male, so you need to germinate 40 seeds to see all of the phenotype expressions if you intend to breed.
This is according to Heavy Dayze on the podcast growing with the fishes episode 95 minute 36 42 seconds.
Now I need to buy 3 more packs of everything!