"It Skips a Generation": Myth or Genetic Reality?

The phenomenon: observed across millions of families

The idea that resemblance "skips a generation" is universal — every culture has noticed it. The grandfather and grandson who strangely look alike, the grandmother seen again in her teenage granddaughter. And the parent, sandwiched in between, who looks like something else entirely.

Geneticists confirm: it's a real biological phenomenon, tied to recessive genes. Here's how it works.

The genetic explanation: hidden recessive genes

For a visible trait to "skip" a generation, it must be coded by a recessive gene. A recessive gene only expresses if the individual carries two copies (one from each parent).

Concrete green-eye example:

• Paternal grandmother has green eyes (two copies of the recessive gene)
• The father inherits one green copy (from his mother) and one brown copy (from his father) → he has brown eyes but silently carries the green gene
• The mother also carries a silent green gene (e.g., from her grandfather)
• If the child draws both green copies, their eyes are green → "just like grandma"

The trait didn't actually "skip": it was present at every generation, just masked.

Which traits skip most often?

The following traits frequently "skip" because they're coded by recessive genes:

• Light eye colours (blue, green) versus brown
• Red or very pale blond hair
• Freckles
• Dimples (actually polygenic but with partial recessivity)
• Nose or jaw shape specific to a lineage
• Height to a degree

Conversely, dominant traits (brown eyes, dark hair, etc.) skip less often: they express as soon as at least one copy is present.

Why grandma is often right

There's also a psychological and memory-based dimension. Grandparents have a longer visual memory: they remember their parents, siblings, distant cousins. When they see a child who resembles a deceased great-uncle, they notice it immediately — while young parents lack the reference.

So yes, "you're the spitting image of your grandfather" is often true — not because the generation skipped, but because grandma is the only one with the context to see it.

Test it with the LLM Engine

If you have an old photo of a grandparent at the same age as your child, this is the time to test. Our Look Like Me LLM Engine works on any two faces — not just parent/child.

Many users are surprised: a 60-75% score between a child and grandfather is common, sometimes higher than the resemblance to actual parents. It's rarely a coincidence — it's recessive genetics revealing itself.

For Grandparents Day, it's the most moving family experiment: pull out the old photos and run the test.