In simple dominance, what is the result when a dominant allele pairs up with a recessive allele?

According to Mendel's law of dominance,

in such a situation the dominant allele is displayed externally while the recessive allele remains masked i.e, the recessive remains in the genotype along with the dominant allele while in its phenotype, only dominant remains.

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you