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Why Bird Penises Are So Weird
To learn more about this topic, start your googling with these keywords:
- Sex chromosome: A chromosome involved in determining the sex of an individual.
- Cloaca: A posterior orifice that serves as the only exit for the gastrointestinal, urinary and genital tracts.
- Mutation: An alteration in the DNA sequence that makes up a gene.
- Sexually-selected Trait: A trait based on a mutation that confers a reproductive advantage.
- BMP4: A protein whose presence halts the growth of bird penises in the egg.
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Published on 9 months, 2 weeks ago