If being left-handed isn't a recessive gene, then why are only 12% of the population left-handed?

[Marblesxoxo]

Well over the years, I've trained myself to use my right hand in case. Nowadays I used both but originally I'm left-handed. Besides me being left-handed, only my mother's great-grandfather (my great-great grandfather) was.

I've already checked that it's not a recessive gene. If it's not recessive then why are there only 12% left-handed. My siblings and I were raise the same, same parents, same environment but I'm left-handed while they're not.

[msc545]

Left-handedness is influenced by multiple genes, but it doesn’t follow a simple dominant-recessive inheritance pattern like eye color. These genes contribute to brain asymmetry and handedness, but their effects are probabilistic, not deterministic. The 12% prevalence of left-handedness arises because it’s a product of many interacting factors. While genetic predisposition exists, it doesn’t determine handedness alone. The overall balance between advantages, disadvantages, and environmental pressures has maintained left-handedness as a stable minority trait throughout human history.

[Marblesxoxo]

It's interesting how the genes beat the odds. From my mother's great-grandfather to me, that's several generations it skipped. That's so far back and yet the genes resurfaced again after all those dormant years.

[msc545]

Jeans interact with each other and interesting and occasionally unpredictable ways. It may seem odd that you expect genetic traits like eye color and hair color don't quite match up and so many people think that he can't be related to me because he doesn't look like me or things of that nature. But in fact, the genes are are in the end. The controlling factors. Genes are extremely powerful.

[jahaims]

Handedness is a complex trait that doesn't follow simple patterns of inheritance.
The heritability of left-handedness is low, at about 25% in twin studies.
Most left-handed people are left-handed due to random fluctuations of chemicals in the embryo.

[NaultD]

My guess it's closer to learning a language. There's an age range where you are good at learning then it drops off quickly. From there environment is more impactful.

[exitseven]

There are still teachers like the one I had in first grade that hit you in the hand with a pointer when she saw you write with your left hand. I would not be broken and I am left handed today.

[Marblesxoxo]

That's abusive. It's sad to hear teacher were ignorant back then.

[Marblesxoxo]

*teachers

[exitseven]

It helped make me the man I am today. No respect for authority

[brayden2010]

I'm left handed and so is my mom.

[Marblesxoxo]

You inherited it so quickly. Meanwhile it my case, it skipped several generations before reaching me.

[brayden2010]

yeah it think it skipped a few before my mom cause I dont know anyone else in our family that is.

[Anonymous]

Maybe it has nothing to do with gene

[Marblesxoxo]

Then I don't know what's the reason for this difference. Like stated, my siblings and I were raised in the same environment, same house, same family.

[Opinion Owner]

Being raised in the same environment doesn't mean you should be like them or them like you. You start to use your hands around a year old, maybe your little self felt like left hand is more comfortable and that you can control it better