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Genetics do play a part in handedness, but only some of the time.
Plenty of research has been done to try and understand the complex inheritance pattern of handedness, and two single gene model theories have been proposed to date.
You are more likely to become left-handed based on the presence of one or more genes, but you may need an environmental trigger for it to happen. Parents have been caring tenderly for their babies since the dawn of time, but the way they have done so has evolved and changed over the generations.
If you do belong to the lucky 10% of the world’s population who are left-handed, know that you are in good company. Those changes could result from technological or social changes, advances in medical knowledge and understanding, or shifting...
If that were the case, any time two lefties had a baby, the baby would turn out left-handed. It’s known that if both parents are left-handed, there’s only a 25% to 50% chance their child will be left-handed.