Basic Trope: Earth's population has been greatly reduced.
- Straight: After the End, Alice and Bob have an awfully hard time finding other survivors.
- Exaggerated: Alice and Bob are literally the only people left.
- Downplayed: There are many survivors, but not all are willing and able to reproduce.
- Justified:
- A major catastrophe has happened, and decimated Earth and its population.
- Alice and Bob are Starfish Aliens that can reproduce asexually as well as sexually.
- Inverted: Alice and Bob are just two members of Earth's large population, which is reaching the tipping point.
- Subverted: Alice and Bob find other fertile adults after a lot of searching.
- Double Subverted: But not enough of them to maintain a genetically-diverse enough population for more than a couple of generations.
- Parodied: Adam and Steve are the only survivors... And must figure out this whole Homosexual Reproduction thing.
- Zig Zagged: The population fluctuates between too many fertile, non-related adults, just enough of them, and not enough of them throughout history.
- Averted:
- Alice and Bob have plenty of potential mates to choose from.
- Alice and Bob were wiped out along with everyone else.
- Enforced: Rule of Drama in a post-apocalyptic Sci-Fi series.
- Lampshaded:
- "Hello! Is anyone else out there?"
- Alice and Bob rename themselves Adam and Eve in recognition of their new mission in life.
- Invoked: A bunch of wars happen, and only a few people survive.
- Exploited: Alice uses their situation to coerce or outright bully a reluctant Bob into trying to reboot the human race. (Or vice versa.)
- Defied: Alice and Bob decide not to reproduce; they're not attracted to one another, and there aren't enough non-related, fertile adults to sustain the population anyway.
- Discussed: "Alice, what if I were the last guy on Earth?" Beat "Over my dead body, Bob."
- Conversed: "Two people cannot repopulate an entire planet."
- Deconstructed: Two people cannot repopulate (or populate) a whole planet. There needs to be a sufficient number of non-related fertile adults to accomplish this and ensure the long-term survival of the species. Plus there could be squabbles over who gets to mate with whom and when depending on the male-to-female ratio and how marriage and relationships are handled (if they're handled at all.)
- Reconstructed:
- Alice and Bob and the others (if there are any) find a way to overcome the DNA issue...or just make the best of their time if that's not an option.
- Alice and Bob may be the only two humans left, but they have fortunately have access to a DNA bank which addresses the genetic diversity issue. However, the children born will still need parents to take care of them and bring them up so that knowledge and skills of the world around can be passed down to future generations.
- Played For Laughs:
- Adam and Steve are the only ones left, and must figure out a way to use Homosexual Reproduction. It works, much to the ire of Steve.
- Alice and Bob don't get along.
- Played For Drama: Jealousy ensues as people begin to pair off.
- Implied: After the apocalypse, Alice and Bob have sex. It might just be Glad-to-Be-Alive Sex, but it doesn't look like there are too many people left...
- Logical Extreme: Humanity emerges from just one man and his Opposite-Sex Clone which copied his X chromsome. Any genetic diversity is solely from mutations.
Back to Adam and Eve Plot... I guess it's just you and me now.
