If one trait covers up one we say that it is the other one that is cover-up is

i). Dominant Allele.

ii). Recessive Allele

Explanation:

A dominant allele completely dictates the appearance or phenotype of heterozygotes. One allele is said to be dominant over another if a heterozygous individual bearing the allele has the same appearance as an individual who is homozygous for it.

A recessive allele is one who phenotypic expression is completely masked in heterozygotes by the presence of a dominant allele.

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