Incomplete dominance situation in which one allele is not completely dominant over another allele
Codominance situation in which the phenotypes produced by both alleles are completely expressed
Multiple allele a gene that has more than two alleles
Polygenic trait trait controlled by two or more genes
Environmental effect Environmental issues are harmful effects of human activity on the biophysical environment. ... Environmentalism, a social and environmental movement, addresses environmental issues through advocacy, education and activism.