There is relatively little heterosis in tomato and what does show up is usually mid-parent heterosis where the offspring are between the extremes of the parents. To get significant levels of heterosis, you have to work with novel genetics such as S. Pimpinellifolium or S. Habrochaites.
The gene controlling early flowering is recessive. It only shows up in the F2.
The gene for determinant is penetrant. It shows up as plant size between the two parents.
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