Baby Traits Calculator

Genetics can seem incredibly complex, but the basics of how some simple traits are passed down can be understood with two key concepts: dominant and recessive alleles. This calculator provides a fun way to explore these principles using common, observable traits (phenotypes).

Dominant vs. Recessive Alleles

For every gene, you get one version (an allele) from each parent.

• A dominant allele is like a loud voice. You only need one copy of it to show the trait. For example, the allele for dimples is dominant.
• A recessive allele is like a quiet voice. You need to inherit two copies of it (one from each parent) for the trait to show. The allele for no dimples is recessive.

How It Plays Out

Let's use dimples as an example:

• If both parents have no dimples (the recessive trait), they can only pass on "no dimple" alleles. Their baby will almost certainly not have dimples.
• If one parent has dimples and the other doesn't, the odds are roughly 50/50. The parent with dimples could pass on either a "dimple" allele or a "no dimple" allele they might be carrying.
• If both parents have dimples, there's still a chance they could have a baby with no dimples! If both parents are "carriers" of the recessive "no dimple" allele, there's a 25% chance their baby could inherit both recessive copies and end up without dimples.

A Fun Introduction to Genetics

This calculator uses a simplified model based on these principles. It's a great way to introduce the concepts of heredity. For a more in-depth look with a visual Punnett Square, be sure to check out our Advanced Baby Genetics Calculator.