What does it mean when we say a trait is dominant?
a: both parents must contribute alleles for this trait to appear.
b. offspring carry unmatched alleles
c. offspring show this trait even if only one parent contributes the allele.
d. there is more than one gene for the trait.

C.Offspring show this trait even if only one parent contributes the allele.

Explanation:

Dominant trait is the one that is expressed in both heterozygous and homozygous genotypes. The heterozygous genotype carry one dominant and one recessive allele for a trait but exhibit the dominant phenotype only.

Example: A cross between pure breeding tall (TT) and pure breeding dwarf (tt) plant gives all tall (Tt) progeny. Here,  the tall progeny has received one "T" from tall parent and one "t" allele from the dwarf parent.

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