I grew about 72 F2 sungold plants last year. About ten percent of the fruits were red instead of orange (cross pollination or segregation?). One plant of the 72 had exerted stigmas. The size of the fruits varied from a little smaller than F1 to a bit larger.
Joseph Lofthouse wrote:
Based on the smell of Sungold foliage, and it's flowers attractiveness to pollinators, I speculate that an ancestor is Solanum habrochaites, a wild tomato. For what it's worth, I don't observe any indication, based on how the plants grow and segregate, that Brandywine was a recent ancestor to Sungold. I didn't recover any beefsteak-type fruits or flowers from the offspring.