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I was looking into cockatiel varieties and found out about Lutino Pearls. They look gorgeous, but seem impossible according to what I think I know about genetics.

Here's how I understand it. Sex linked genes are linked to the X chromosome. Females that have the gene will display it and cannot be split to a sex linked gene. According to what I've read, a female bird cannot have two sex linked genes at once, right? Then why am I finding all these images of adult female Lutino Pearls? I'm rubbish at the technical jargon for genetics, so if someone could hold my hand and explain this to me...
 

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Females can have several sex-linked mutations at the same time. That's because there are lots of different genes on the X chromosome, and each mutation is caused by a different gene.

The sex-linked mutations are lutino, cinnamon, pearl, and sex-linked yellow cheek. It's possible for a cockatiel to have all four of them at the same time, or any combination of them, whether the bird is male or female.
 
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