What are some examples of alleles

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Examples of alleles

Humans

ABO blood group: IA, IB, i (codominance of A and B).
Hemoglobin (sickle-cell): HBB alleles A (normal) and S (sickle).
CFTR (cystic fibrosis): wild-type vs ΔF508 mutant.
Lactase persistence: LCT −13910*T (persistence) vs −13910*C (non-persistence).
Eye color (OCA2/HERC2): brown-promoting vs blue-associated variants.

Classic genetics (plants/animals)

Pea plant (Mendel): T (tall) / t (dwarf); Y (yellow seed) / y (green); R (round) / r (wrinkled).
Snapdragon: R¹ / R² (red/white; incomplete dominance → pink).
Fruit fly: w (white eye) / w⁺ (red); vg (vestigial wing) / vg⁺ (normal).
Mouse coat color: A (agouti) / a (non-agouti); B (black) / b (brown).

Alleles are alternative forms of the same gene that produce different traits; they can be dominant, recessive, codominant, or show incomplete dominance.

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