[quote]andy1970 wrote:
Hello, I did not know where else to post this, there does not seem to be a General topic, so here it goes.
I have looked at every single family that I have come across, from school, friends, extended family, wive’s friends and so on, and in all those families I have noticed that :
- boys at the age of 13-15 have reached or overtaken their fathers in height
- regardless of the mother’s height - indeed there are some very short mothers, eg 1m60, yet the boys reach the dad’s height at age 14-15-ish
Even when I go holidays, meet other families, and social circle, basically everywhere, I am not aware of one single family where the boys are shorter than the dad.
In all except my family, my eldest son who will soon be 18 is shorter than me, and my youngest son who is 15 has reached his brother in height but still shorter than me. All their friends from school who I have met have reached or have overtaken their dads, easy.
So I am wondering what’s happening here. Do you have any stats or any views on the matter?
Regards[/quote]
There are two major genetic factors involved in height. One is a combination of genes, maybe 25 that act in polygenic fashion to set one’s “target” height. If it is typical of polygenetic traits, then you get some from your mom, some from your dad, and they are spread out on different chromosomes.
The second is the age of puberty, and growth plate closure. This MAY be more like a single trait inherited from one or the other parent, at least because it is “all or nothing”. If you get a signal to close growth plates then no different signal is going to matter.
But plates close due to activity levels, and exposure to hormones and nutrition as well. Generally speaking if you delay puberty or you have kids lead an inactive lifestyle, their limbs will grow longer before they stop. If puberty occurs earlier or kids do a lot of impact activity they close earlier. Perhaps it is estrogen in water or food that is making boys stop growing taller at a later point. The same thing might cause earlier puberty among girls, but I’m not an expert in endocrinology.
I am 5-9, but I was 5-9 in 7th grade. My brothers both kept going to 6-2 and 6-4, and my dad, his dad, and my dad’s 2 brothers were 6-1 to 6-4.
I was on the same growth path but hit puberty before I turned 12.