Why Men are Taller Than Women on Average

 

When thinking about the average height of everyone in your family, what can you notice? Is dad taller than mom? Or maybe your brother is taller than your sister. How about your circle of friends? Do the boys tend to tower over most of the girls? Recent research has found that there is a specific gene that helps explain this phenomenon.

A study drawn from the genetic data of approximatley 1 million people, published in the Proceedings of the National Academy of Sciences, found that a gene called the SHOX gene may be responsible for this height discrepancy.

The SHOX gene is a growth-regulating gene found on both the X and Y chromosomes, and is a determining factor of one's height as it helps control bone growth, particularly in the appendages. Thus, differences in how expressed the SHOX in men and women can contribute to the variation in height.

A unique feature about the SHOX gene is that, although it is found on both the X and Y chromosome, it is more active and has a stronger effect when on the Y chromosome. Therefore, in women with two X chromosomes, one X is mostly switched off, meaning the SHOX gene on that chromosome is only partly active. But in men with both an X and a Y chromosome, both copies of the SHOX gene are fully active. This results in a slightly stronger growth-promoting effect, which is believed to contribute the the common association that men are taller than women. 

Of course the SHOX gene is not the only gene that determines height and there are numerous other factors at play. However, this discovery allows us to better understand the mystery that is height differences between men and women.

News Article Source: https://www.usnews.com/news/health-news/articles/2025-05-20/scientists-find-gene-that-helps-explain-why-men-are-taller-than-women

More on the SHOX Gene: https://medlineplus.gov/genetics/gene/shox/

Children’s height vs. Parents’ Heights

        Do children tend to be about the same height as their parents or at least inherit the height of one of them? That’s a question many of us might have asked ourselves throughout our lifetime. The typical question every time one goes to the doctor as a child is “how tall are you?” Height has always played a major role in ones life as it did in school for example. Remember the taller students usually had to stand in the back of the class picture and the shorter students in the front row.

        The truth is, though parents’ genes influence the height of a child tremendously, the height outcome of children in many families vary. Other environmental factors like nutrition play a huge role on the resulting height of a child along with the genes inherited as mentioned in the New York Times article. However, though results vary from family to family, doctors today use a formula to calculate the height outcome of most children as adults. Yet, the formulas for boys and girls differ.

      However, say there is a family of two parents and three children of the same sex, though all three children have the same parents and the same sex it does not necessarily mean they will have the same height. I was really amused about the fact that younger children in a family tend to be shorter and grow slower. This article reminded me how important it is for us to do our best at acquiring a solid nutrition. It is so important for us to realize how much environmental factors influence our life and how they have influenced our genes!