Here’s why some pigeons do backflips

Atoosa Samani started learning about pigeon genetics at a young age. She grew up surrounded by pet pigeons in Isfahan, a city in central Iran famed for its pigeon towers. Her favorite was an all-white bird. But 6- or 7-year-old Samani noticed that this particular pigeon never fathered all-white offspring.

She learned that white coloring is a recessive genetic trait — one that shows up only when an individual inherits two broken copies of a gene (SN: 2/7/22). In this case, the pigeon had two broken copies of a gene that normally makes pigment to color feathers, so his feathers were white. But his offspring inherited a normal, pigment-producing

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