Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?
A
a recessive trait that requires multiple recessive alleles to be expressedB
a polygenic trait that is influenced by the alleles of several genesC
a codominant trait that is expressed more often when more dominant alleles are presentD
a dominant trait that depends on the presence of only one of many dominant alleles