Does Height Come From Mom or Dad? Here's What the Science Actually Says
There's a family myth almost every household has heard at least once: sons take after their mother, daughters take after their father. It gets repeated with total confidence at family gatherings — but does it hold up against actual genetics?
Not quite. The real story is more interesting, and involves three things most people have never heard of: sex chromosomes, genomic imprinting, and something called mid-parental height.
The X-Chromosome Myth
A common theory goes like this: boys inherit their X chromosome from their mother, so any height-related gene on the X chromosome must come from Mom alone. It sounds reasonable — until you look at the one gene on the sex chromosomes actually known to affect height.
That gene is SHOX (short stature homeobox), and it sits in a region shared by both the X and Y chromosomes. That means sons and daughters both inherit a working copy from each parent — not just from Mom. The well-documented height reduction seen in conditions like Turner syndrome is about gene dosage, not about which parent it came from.
Where a Real Parent-of-Origin Effect Does Exist
Here's where it gets genuinely interesting: there is a documented phenomenon where only one parent's genetic contribution gets "switched on" — it's called genomic imprinting. The clearest growth-related example is the IGF2 gene, active during fetal development: only the paternal copy is active, while the maternal copy stays silent.
Researchers have proposed an evolutionary explanation for this — sometimes called the parental conflict hypothesis — describing it as a kind of biological push-and-pull between the father's genome (favoring more prenatal growth) and the mother's genome (moderating it).
So What Actually Predicts a Child's Height Best?
Not one parent's height in isolation. A large cohort study of more than 161,000 children found that mid-parental height — the average of both parents' heights — was consistently the strongest predictor, outperforming either parent's height alone.
The full article breaks down the research in detail, addresses the mixed evidence around "sons look like dad, daughters look like mom," and includes a free calculator to estimate a child's likely adult height range using the mid-parental height method.
Read the full breakdown here: Does Height Come From Mom or Dad?
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