Two Alleles Control a Trait for Pathogenicity in a Species

Two alleles control a trait for pathogenicity in a species of bacteria. Those homozygous for allele A cause a virulent disease upon infection of a host, whereas those homozygous for allele B cause no symptoms whatsoever. Bacteria carrying both alleles cause a mild disease upon infection of a host. No other differences in phenotype were observed. If allele A produces a dose-responsive toxin and allele B produces no toxin, what kind of trait would this be?

A) Codominance
B) Incomplete dominance
C) Pleiotropy
D) Sex-linked
E) Epistatic

Correct Answer:

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