How does our DNA relate to our personality and appearance?
We get half our genes from our biological mother and the other half from our father. That’s why we don’t look exactly like our parents, but we may look a bit like them — and may also think and act similarly to them.That said, each of us still has a unique collection of genes overall. That means no two people carry exactly the same genes, not even brothers and sisters. And that’s why each of us has a unique appearance and personality.
What do our genes decide?
Our genes help explain many parts of our appearance, like how tall we are and the colour of our eyes.They also have a hand in our other skills, such as how fast we can run, how good we are at solving problems, and whether we enjoy talking to new people (rather than if we feel shy).
By studying a person’s genes, scientists can tell whether that person is more likely to have blue or brown eyes, without even seeing them.
They may also be able to tell that person how likely they are to develop certain medical conditions later in life, such as cancer or myopia (when you can’t see far-off objects as clearly).
Not everything is determined by genes and DNA
Although genes are important, they’re not the only reason for why we look, think, feel and act as we do — or why we’re more likely to have certain diseases. While some traits such as eye colour are mainly determined by our genes, an eye injury can change someone’s eye colour.
Our habits, such as how much we eat and exercise, also have a big impact on who we are and what we look like. If you eat too much junk, you’ll probably get chubby and start running slower, regardless of the genes your parents gave you.
Our environment at home, school and/or work play a key role in shaping us, too. Take myopia. Before the discovery of the more than 400 genes for myopia, scientists noticed children are at least three times more likely to be myopic if either one or both parents are. They realised if someone has trouble seeing far-off objects, there’s a decent chance this is related to genetics.
At the same time, however, there is currently a surge in myopia happening around the world, with more people becoming myopic even though their parents are not!
Researchers discovered our environments and habits play a huge role in myopia development. For instance, they found myopia (and the need to wear glasses) is more likely to happen among people living in cities rather than the country, and those who spend less time outdoors.
The future is in your hands
You can think of your genes as a way to understand yourself — but not as a way to make decisions. For example, just because someone’s parents may not have been able to go to university, they themselves can if they study hard. Or, a person’s parents may be overweight, but that doesn’t mean they have to be. They can still join a sprint team if they’re willing to put in the effort.
Even though your DNA and genes shape a lot of your personality and appearance, remember: they do not determine your life story.
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