Genetics System: How Traits Pass to Children

How Genetics Work

Paralives features one of the most detailed genetic systems ever implemented in a life simulation game, developed by programmer Anna Thibert who has a background in bioinformatics. The system is heavily inspired by real-life genetics, with dominant and recessive genes, alleles, and generational inheritance — but simplified enough to remain fun and accessible.

Genetics in Paralives revolve around physical attributes only. Personality traits, Vibes, Talents, and Social Perks come from player choices and in-game activities — they cannot be inherited. This means that while you can breed for appearance, each generation's personality is shaped by gameplay, not genetics.

Screenshots

DNA Genetics Diagram

Family Tree Heredity

Color Inheritance

Slider-Based Traits

What Gets Passed Down

Slider-Based Genetics

Slider-based traits (height, facial features like nose shape and eye size) use a direct inheritance system where each feature randomly selects one parent's entire slider set.

For example, a child's nose might inherit all the nose sliders from Mom, while their eyes might inherit all the eye sliders from Dad. This keeps features coherent — no weird "mixed" slider values — and makes family resemblance immediately visible.

Height Genetics

Height works slightly differently. Rather than inheriting exact slider values, children inherit one parent's height range category (short, medium, or tall), and then their exact height is randomized within that range. This guarantees height variation between siblings — two children with the same parents can end up at different heights within the same range.

Gender also plays a role in height randomization, so male and female children from the same parents can have different average height distributions.

Color-Based Genetics

Color traits (skin, hair, and eyes) use an indirect inheritance system with dominant and recessive genes — very similar to real human genetics. This means:

• Traits can "hide" in a parent's DNA and reappear in grandchildren or later generations
• A child might inherit their grandmother's eye color even if neither parent shows that color
• The genetic code uses genes and alleles, making heredity predictable if you understand the system

Color Regions

Most color traits have multiple color regions (skin has Base, Highlights, Shadows, and Blush; hair has base, root, highlight, and tip colors). Only the base color is used for genetics — the other regions are cosmetic-only and won't be passed to children.

Skin Color Specifics

For skin color, children inherit the brightness (lightness/darkness) from one parent, and then a random skin color swatch within that brightness range is selected. The exact hue might differ slightly from either parent, but the general skin tone category is preserved.

Heterochromia

Parafolks with two different colored eyes (heterochromia) only pass one eye color to their children — and the heterochromia itself is not inherited. The game randomly selects which eye color becomes the genetic default.

Hair Texture Genetics

Hair texture uses a dominance hierarchy: Coily > Curly > Wavy > Straight. The most dominant texture "wins" when mixed. Here's how it works:

• If one parent has curly hair (C) and one has straight hair (S), the child has a 50/50 chance of curly or straight
• If one parent has coily (CO) and one has wavy (W), coily wins
• The game selects one parent's hair texture as the child's base, then picks a random hairstyle from the genetically appropriate category

Unnatural Colors

Paralives allows you to create Parafolks with "unnatural" colors — neon pink hair, blue skin, purple eyes — but these have important genetic implications:

If a Parafolk's hair is partially unnatural (e.g., a subtle dark blue that's close to black), the game uses its color-matching system to determine if it's close enough to a natural color. Subtle unnatural tints may be preserved; bold unnatural colors will be replaced.

Personality Genetics

It's important to understand what genetics do not affect. Personality traits in Paralives come entirely from player choices and gameplay:

• Stats — Set during creation, not inherited
• Vibes — Shaped by gameplay and choices
• Talents — Assigned during creation, cannot be passed down
• Social Perks — Set at creation, learned through gameplay
• Lifestyles — Player-defined preferences

This means every generation starts fresh in terms of personality — you can't breed for "smart" or "artistic" Parafolks. Instead, you develop each generation through intentional gameplay choices.

Modding Genetics

The genetics system is fully moddable. Modders can:

• Create custom genetic rules different from vanilla (e.g., new hair colors with specific inheritance patterns)
• Add new genetic attributes (e.g., elf ears with recessive inheritance)
• Set texture types for custom hairstyles to make them inheritable
• Theoretically create new species with entirely different genetic rules

Planning Tips for Genetics

1. Create both parents with similar traits for more predictable children. Different dominant/recessive combinations make outcomes less certain.
2. Check appearances before children. There is no genetic preview tool. You'll only see what traits pass down after children are born.
3. Use the color wheel for fine control. Preset colors might not give you the exact genetic outcome you want. Custom colors let you be more precise.
4. Natural colors only for planned families. If you're building a family dynasty, avoid unnatural colors — they'll be silently replaced with unpredictable natural colors.
5. Document your creations. Keep track of which traits both parents have if you're trying to achieve specific outcomes.
6. Embrace the randomness. The genetics system creates genuine surprises. Part of the fun is not knowing exactly what your children will look like.