Which statement best describes Mendel’s Law of  dominance? 

Genetic factors are not paired, but rather occur singularly, determining traits independently without any dominant or recessive interactions.

Traits are controlled by discrete units called factors that exist in pairs and in each pair, one factor is dominant and masks the expression of the other factor. 

Every trait is controlled by a single factor, and both alleles are equally expressed in the phenotype.

All genetic factors have equal chances of being expressed, and no single trait can dominate over another in the phenotype.