What is the genetic allele that masks the others if both are present

DOMINANT

Allele is the alternative form of same gene. Genes are expressed by phenotype which is the physical characteristics made by genotype and these are observable and dectectable. Another form of allele is the recessive one. This is the allele that is being masked in the phenotype if there is the presence of a dominant allele. All of these falls on genetics which is the study of structure and action , patterns of heredity. This usually use gene as the unit of inheritance and occurs in a location on the chromosome.