Not a lot to say here; the situation is complex.
Salaman showed that round tubered varieties breed more or less true with respect to shape.
Oval tubers when selfed give all types - long, oval and round.
The difference between long and round is thought to be due to a single gene which is incompletely dominant for round
Pictures (click on small images for detail):
LONG: Mayan Gold
ROUND: Red King Edward
OVAL: British Queen
IRREGULAR: Pink Fir Apple
Nigel Deacon / Diversity website
based on Crane & Lawrence, 1934
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