Bird sex chromosomes are drastically different than ours. What makes them so unique?
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DNA that only females have
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“In many animal species, the chromosomes differ between the sexes. The male has a Y chromosome. In some animals, however, for example birds, it is the other way round. In birds, the females have their own sex chromosome, the W chromosome. For the first, researchers have mapped the genetic structure and evolution of the W chromosome.”
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