In the same way, features created by recessive alleles only show up if there isn’t a dominant allele around. If you wear one of each, only the jacket will be visible. You can think of recessive alleles as t-shirts, and dominant ones as jackets. The blond allele is recessive, and gets covered up. That means that even if only one of your two alleles is for brown hair, your hair will be brown. It turns out that brown hair is dominant. What happens if you got a ‘brown’ allele from your mother, and a ‘blond’ one from your father? Brown allele, brown hair.īut there’s a catch - you have two copies of each of your genes. Seems simple enough, right? You have the blond allele, you have blond hair. Let’s pretend that there’s just one gene that controls hair color, with a ‘brown’ and a ‘blond’ allele. ![]() And your genes can come in different versions, called alleles. You probably know that DNA is organized into small pieces called genes, which help control how our bodies are built. ![]() How could blond-making DNA be hiding in every cell of a brunette person’s body without them growing any blond hair? The answer lies in understanding ‘dominant’ and ‘recessive’ features. If two brunette parents have a blond child, that means they had to have instructions for making blond hair hidden in their DNA. I’ll give you a mostly-true answer first, and then dive into the ugly details if you’re still with me. The genetics of hair color is still a bit of a mystery, but we do know a few things.
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