Allelic genes are always found on the same chromosome regions and are responsible for 1 trait.
Non-allelic genes are responsible for different traits.
The interaction of allelic genes can manifest itself in:
complete dominance (pea yellow dominates over green);
incomplete dominance – heterozygotes acquire a new phenotype (red color of strawberry does not completely dominate over white and heterozygotes are pink);
codominance, when the allele is represented by more than 2 genes (inheritance of blood groups in humans).
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