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ClueBot NG (talk | contribs) m Reverting possible vandalism by Xalessi to version by Okterakt. Report False Positive? Thanks, ClueBot NG. (4340461) (Bot) |
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[[File:Hair colors punnett.png|thumb|right|A [[Punnett square]] showing how two brown haired parents can have red or brown haired children. 'B' is for brown and 'b' is for red.]]
[[File:Redhead close up.jpg|thumb|180px|left|Red hair is a [[Dominance relationship#Recessive allele|recessive]] trait
Although the red color allele is still there in this brown-haired girl, it doesn't show. This is a difference between what is seen on the surface (the traits of an organism, called its [[phenotype]]) and the genes within the organism (its [[genotype]]). In this example, the allele for brown can be called "B" and the allele for red "b". (It is normal to write dominant alleles with capital letters and recessive ones with lower-case letters.) The brown hair daughter has the "brown hair phenotype" but her genotype is Bb, with one copy of the B allele, and one of the b allele.
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