How many gene pairs are involved in generating a typical 1:8:28:56:70:56:28:8:1 ratio in the F2 generation of an experimental cross

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