Eli5:what’s the cause of someone being right or left handed? And why the vast majority is right handed?

Question

Eli5:what’s the cause of someone being right or left handed? And why the vast majority is right handed?

In: Biology

Answer 1

Since there are rare fetal malformations impacting limbs, what happens if a right handed fetus looses function in the right limb?

Obviously they adapt, but is the ceiling lower on their dexterity than if they had been a left handed fetus in the same situation?