The principle of dominance states that
a. all alleles are dominant.
b. all alleles are recessive.
c. some alleles are dominant and others are recessive.
d. alleles are neither dominant nor recessive.

some alleles are dominant and others are recessive

Explanation:

The principle of dominance states that some alleles are dominant and others are recessive. Alleles are alternative forms of a gene controlling a particular characteristic. Dominant allele are expressed phenotypically in the hybrid homozygous or heterozygous state. Recessive alleles are expressed phenotypically only in the homozygous condition.