Explain in your own words why a dominant trait is not always a common trait.

Describing a trait as dominant does not mean it is the most common; it means that it is expressed over the recessive trait. For example, tongue rolling is a dominant trait, controlled by the dominant version of a particular gene (R). Individuals with one or two copies of R will exhibit tongue rolling.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.