dominant allele - an allele that produces the same phenotype whether its paired allele is identical or different
recessive allele - an allele that produces its characteristic phenotype only when its paired allele is identical
Imagine that two alleles will always be present in forming a phenotype. Some are dominant and some are recessive.Recessive alleles will not show up if there is a single dominant allele present. Dominant alleles take priority over recessive alleles so if there is a single dominant allele present it will always effect the phenotype.
For example:
B - dominant
b - recessive
bb = recessive shows through
BB = dominant shows through
Bb = dominant shows through
bB = dominant shows through
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