When a litter of puppies is born, the pups will exhibit certain physical characteristics that can be found in one or both of the parent dogs. These characteristics passed down from parent to offspring are considered to be-

Chromosomes

Explanation:

inside the nucleoplasm of a cell are small thing coloured threads called chromosomes, they help in transmitting or inheritance of characters in form of genes

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.