What is the difference in the role of an operator and the role of a promoter?

answer; a male inherits only one allele of the x-linked gene controlling hair color;

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a