I am not Mijke but will answer.
If you declare a carrier as p(ositive for dwarf)/n(negative for dwarf), it means that in an egg or a sperm there is only one p or one n, in combining two carriers you get the possible pairings p/p, p/n and n/n. what means you can get negativ (no dwarf gene) dogs by pairing two carriers. The only problem is you might get some p/p out of this pairing.
Ina
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