Attached Earlobe Inheritance Calculator

The Attached Earlobe Inheritance Calculator helps you determine the likelihood of your child inheriting attached or free earlobes based on the genotypes of both parents. This simple yet fascinating trait is commonly used in genetics education to illustrate dominant and recessive inheritance patterns through Punnett Squares.

Earlobes come in two main types:

• Free earlobes (F): Hang loosely from the head and are dominant
• Attached earlobes (f): Connect directly to the side of the head and are recessive

These traits are determined by a single gene pair (alleles), and the combination of alleles from both parents influences the child’s physical appearance.

Only individuals with the ff genotype will have attached earlobes. The presence of even one dominant allele (F) will result in free earlobes.

1. Select the genotype of Parent 1 (FF, Ff, or ff)
2. Select the genotype of Parent 2
3. The calculator simulates all possible combinations of alleles using Punnett Square logic
4. It calculates the probabilities of the child inheriting each phenotype

Example:

• If both parents are Ff, there’s a:
  • 25% chance of FF → Free earlobes
  • 50% chance of Ff → Free earlobes
  • 25% chance of ff → Attached earlobes

This tool is ideal for:

• Students learning about Mendelian genetics
• Teachers introducing Punnett Squares
• Parents curious about hereditary traits
• Genetics hobbyists exploring physical inheritance

It brings dominant and recessive gene expression to life in a visual, interactive way.

Can two parents with free earlobes have a child with attached earlobes?

Yes—if both are Ff, they can each pass on the recessive allele (f), producing a child with the ff genotype.

Can a child with free earlobes have parents with attached earlobes?

No—two parents with ff can only pass on the f allele, meaning their children will also have attached earlobes.

Is this trait purely Mendelian?

It’s traditionally taught as a Mendelian trait, but real-life variation can exist. However, this calculator uses the basic dominant/recessive model for clarity and educational value.

• Co-Dominance
• Incomplete Dominance
• Lethal Allele
• Eye Color Punnett Square Calculator
• Complex Traits Inheritance
• Widow’s Peak Inheritance

The Attached Earlobe Inheritance Calculator is a simple yet powerful way to learn how traits are passed from parents to offspring. It blends classic Punnett Square modeling with real-world curiosity about family traits. Whether you’re teaching genetics, learning biology, or exploring your family’s genetic story, this tool is a fun and educational resource.