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 recessive trait that requires multiple recessive alleles to be expressed
- a polygenic trait that is influenced by the number of alleles present
- a codominant trait that is expressed more often when more dominant alleles are present
- a dominant trait that depends on the presence of only one of many dominant alleles
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