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More than 10,000 seedlings were studied to elaborate the mode of inheritance of seedlessness in grapes ( Vitis spp.). Self-pollinations of seeded selections having seedlessness in their parentage gave 0 to 10.7% seedless progeny. Crosses between seeded selections with seedlessness in one or both parents gave similar proportions. Crosses of seeded × seedless selections gave 0-55% seedless. Results were extremely variable, without apparent correlation to normal genetic ratios. Seedlessness appeared to be largely controlled by recessive factors.
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Loomis et al. (1979) studied this question.
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