Chromosome Lib
Chromosome Lib is a library that adds chromosome-based genetics to entities such as sheep, cows, polar bears, humans and villagers.
What it does
The mod registers its own structures for inherited characteristics, so other mods can share one framework for them. Several built-in chromosomes cover vanilla animals including sheep, cows and polar bears, plus humans. Offspring inherit their chromosomes automatically, with gene recombination, mutation and default gene selectors available as reusable parts.
The library is meant for wildlife and animal husbandry mods that want realistic breeding, for RPG mods that need hereditary traits, and for educational projects that teach genetics. Developers who want to build on it are asked to read the documentation first, since the system must be understood before a dependent mod is written. The mod declares Fabric API as its required dependency and is open source under the GNU Lesser General Public License v2.1 only.
Key features
Five custom registries
Each layer of the inheritance model has its own registry for mods to add entries to.
Extensible trait system
Developers can define custom observable characteristics and attach them to the genes an entity carries.
Conflict prevention
The library stops two mods from registering different chromosomes for the same entity.
In-game commands
Players can show and modify the genes of entities and reassign their traits based on those genes.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Required by 1 mod
Use cases
Realistic breeding
Animal husbandry mods can use inherited traits so that offspring of different parents look or behave differently.
Hereditary RPG traits
RPG mods can pass characteristics from one generation to the next through the shared gene system.
Who it’s for: Developers building mods on top of inheritance mechanics, and server owners who want genetics in their animal or RPG content. Players who only want the library itself will see its commands and built-in animal chromosomes.
Questions
Does Chromosome Lib need Fabric API?
Which mod depends on Chromosome Lib?
In the catalog
Chromosome Lib is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 34,764 mods support Minecraft 1.20.1.
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What the author says
This is a library mod that introduces chromosome-based genetic mechanisms for entities, such as villagers, sheeps, cows, in Minecraft. It does not provide any actual functionality on its own, but serves as a powerful and compatible library that integrates traits and genetic systems for dependents. For developers to…
Official listing
- Modrinth page
- modrinth.com/mod/chromosome-lib
- Owner
- Viola-Siemens
- Published
- 2025-11-15
- Updated on Modrinth
- 2025-11-17
- Facts verified
- 2026-10-15