Specific combining ability mainly depends on which of the following genetic variances?

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Variance due to dominance effectsInteraction between additive and dominance gene effectsEpistatic interaction involving dominance genesAll the aforementioned factors

Explanation

Specific combining ability arises from various genetic interactions including dominance variance, additive by dominance epistasis, and dominance by dominance epistasis. Therefore, all these components contribute to specific combining ability.