1. a genetic phenomenon in which heterozygotes have greater fitness or vigor than either homozygote parent
Usage: genetics; biology
2. excessive dominance or control over others
Usage: general usage

Examples

• Overdominance explains why hybrid corn often grows taller and produces more grain than its parent varieties.
• The phenomenon of overdominance is important in plant and animal breeding programs.
• Scientists study overdominance to understand why some crossbred organisms show superior traits.
• His overdominance in group discussions prevented others from contributing their ideas.
• The manager’s overdominance created a tense work environment where employees felt intimidated.
• Overdominance in heterozygotes can lead to increased disease resistance in crops.