Widow’s Peak Inheritance Calculator

The Widow’s Peak Inheritance Calculator is a genetics-based tool that estimates whether your child will inherit a widow’s peak (a V-shaped point in the hairline) or a straight hairline. This trait is commonly taught as an example of a dominant vs. recessive genetic trait—making it an ideal case study for Punnett Square applications. Discover accurate and free multi-trait genetics tools on our main site.

A widow’s peak is a distinct point in the hairline that dips down in the center of the forehead. This trait is controlled by a gene where:

• W (dominant allele) = Widow’s peak
• w (recessive allele) = Straight hairline

Someone only needs one W allele to display the widow’s peak. A person with ww will have a straight hairline.

Here’s how the trait passes down from parents to child:

You can use this calculator by selecting the genotypes of both parents, and the tool simulates all possible combinations using Punnett Square logic to determine the likelihood of each outcome.

This tool is ideal for:

• Biology students learning basic inheritance
• Teachers needing interactive examples of Mendelian traits
• Parents curious about hereditary features
• Genetics educators discussing phenotype expression

It simplifies genetic probability and makes learning visual and interactive.

Can two people with a widow’s peak have a child with a straight hairline?

Yes, if both are Ww, there’s a 25% chance of ww, which results in a straight hairline.

What if one parent has a straight hairline (ww)?

The child’s chance of inheriting a widow’s peak depends on the other parent’s genotype. If the other parent is Ww, there’s a 50% chance; if WW, then 100%.

Is widow’s peak always inherited dominantly?

While often taught as a Mendelian dominant trait, some research suggests it may be polygenic or affected by modifier genes. This calculator uses the traditional model for educational purposes.

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The Widow’s Peak Inheritance Calculator brings classic genetics to life. It’s a great starting point for understanding dominant vs. recessive traits, genotype combinations, and phenotype prediction. Whether you’re a student, teacher, or just curious, this tool helps you visualize how traits are passed down through generations.