Anew trait that allows a more efficient release of energy from food appears in a fly population. the trait proves beneficial to survival and quickly spreads through the population. which is the most likely origin of the new trait? a. the mutation of a gene that results in an altered protein b. the adaptation of a new genes to existing genes in the digestive system c. the combination of recessive genes in each generation d. the replication of a gene that produces an increase in rna ! will award brainliest (:

The answer is A. The mutation of the gene was a beneficial one.  It happened in a few individuals and increased their survival rate. The mutation was also inheritable hence was passed down generations. The new gene probably altered a protein involved in metabolism. There are two other types of mutations; deleterious and neutral.

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