A gene is a trait that you have but a allele is what of that trait?

Trait is a phenotypic character we are looking at(for e.g. height, skin colour, eye color, etc.)

Gene is a segment of DNA that controls the expression of a particular trait i.e. it codes for the proteins required for the expression of that character. (for e.g. gene for height, gene for skin color, etc.)

Alleles are different alternative forms of a gene. (for e.g. gene for height can have 2 alleles- tall and dwarf)

the answers are a and c

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