Marfan syndrome is the result of inheriting a single allele. individuals with marfan syndrome are tall and long-limbed, and have both cardiovascular and eye defects. of what type of inheritance is the phenotype of marfan syndrome an example?

Pleiotropy

Explanation:

Pleiotropy is a genetic term used to describe a phenomenon in which multiple traits or phenotypic expressions are dictated by a single gene.

Pleiotropy was first discovered by Mendel during his experiment with pea plant when he noticed that flower colour is always related to the leaf axil as well as seed coat colour.

There are different types of pleiotropy including:

In the case of marfan syndrome, inheritance of a single allele results in tall and long limb, cardiovascular and eye defects. This thus means that that single allele which represents a gene is responsible for expression of those traits. A clear cut case of pleiotropy.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.