No, it's only for the group of organisms and related. (ex. Felidae=for all cats)
Species
A group of the same species in a particular geographic region is generally called a population.
Endangered species
endangered species
endangered species
an endangered species
A Species
One kind of organism is a species.
No, not every gene is transferable. It takes a bit of knowledge about what a particular gene codes for, and where it would correspond in the second organism.
There are hundreds of thousands of species living today.
ladybugs have a ladybug organism which of course is a living system and can develop.
No. It is not necessary for EVERY member of a species to reproduce in order for the species to survive. Consider humans. Some are infertile and can't reproduce, and some choose not to reproduce, yet the human species survives.