I just found this little tid-bit, and thought I'd share
"purple color in plant leaves and stems frequently shows co-dominance, with the hybrid being purple, but not as purple as the parent"
Breed Your Own Vegetable Varieties: The Gardener's and Farmer's Guide to Plant Breeding and Seed Saving: Carol Deppe. Pg. 101
And some more great info, although quite technical
Abstract
The purple color of the foliage, flower and immature fruit of pepper (
Capsicum spp.) is a result of the accumulation of anthocyanin pigments in these tissues. The expression of anthocyanins is controlled by the incompletely dominant gene
A. We have mapped
A to pepper chromosome 10 in a
Capsicum annuum (5226)
2 Capsicum chinense (PI 159234) F[sub]
2[/sub] population to a genomic region that also controls anthocyanin expression in two other Solanaceous species, tomato and potato, suggesting that variation for tissue-specific expression of anthocyanin pigments in these plants is controlled by an orthologous gene(s). We mapped an additional locus,
Fc, for the purple anther filament in an F[sub]
2[/sub] population from a cross of IL 579, a
C. chinense introgression line and its recurrent parent 100/63, to the same position as
A, suggesting that the two loci are allelic. The two anthocyanin loci were linked to a major quantitative trait locus,
fs10.1, for fruit-shape index (ratio of fruit length to fruit width), that also segregated in the F[sub]
2[/sub] populations. This finding verified the observation of Peterson in 1959 of linkage between fruit color and fruit-shape genes in a cross between round and elongated-fruited parents. The linkage relationship in pepper resembles similar linkage in potato, in which anthocyanin and tuber-shape genes were found linked to each other in a cross of round and elongated-tuber parents. It is therefore possible that the shape pattern of distinct organs such as fruit and tuber in pepper and potato is controlled by a similar gene(s).
http://www.springerlink.com/content/m4pdb02fdav218de/
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