Question

what are purebred organisms

Answer 1

Animals that are made by breeding the same species, like with dogs.
It means that the pedigree only consists of that one race.

Answer 2

Purebred organisms are actually animals that are made by the same Species

Answer 3

This may be useful: http://is.gd/U0qzQr

Answer 4

pure bread is when they mate with their own species so they are not "hybrid species". Like a green pea plant breeding with a yellow pea plant which is a hybrid species. Purebred would be green plant mating with a green plant. hope that helped.