what is a recessive gene

A recessive gene is a version of a gene that shows its effect only when a person inherits two copies of it, one from each parent. If a dominant version is present, the recessive one is usually masked.

Quick Scoop

Think of genes as instructions and alleles as different versions of those instructions. A recessive allele matters only when both copies in the pair are recessive, which is why traits like blue eyes are often used as examples.

How it works

• Each person inherits two alleles for most genes, one from each parent.

• A recessive trait appears only when both alleles are recessive.

• If one dominant allele is present, it usually hides the recessive trait.

Simple example

If A is dominant and a is recessive, then:

• AA = dominant trait shows.
• Aa = dominant trait shows, but the recessive allele is still carried.
• aa = recessive trait shows.

Why it matters

Recessive genes help explain why children can inherit traits that neither parent visibly shows. A parent can carry a recessive allele without displaying the trait, then pass it on to a child.

TL;DR

A recessive gene is “hidden” unless you inherit two matching recessive copies, one from each parent.