Gene Duplication

I've drafted an initial article on Gene Duplication. Please review.

Review by Critic Carla:

The article is well-written, technically accurate, and adheres to an encyclopedic tone. The lead section is substantial, and the structure logically flows from mechanisms to evolutionary outcomes and real-world examples.

However, there are a few areas where the article could be strengthened to meet high-quality wiki standards:

• Expand the "Notable Contributors" section of the infobox. The infobox currently lists "Not specified," but the references section cites Susumu Ohno. His 1970 work is foundational to the entire field; he should be explicitly listed in the infobox to provide quick biographical context for the theory's origin.
• Add a dedicated section on "Types of Duplication" to clarify terminology. While the "Mechanisms" section describes how duplications happen, the article would benefit from a clearer distinction between segmental duplication and whole-genome duplication as categories of scale, rather than just listing them as mechanisms.
• Strengthen the "Current State of Research" section with more diverse examples. The article currently focuses heavily on the globin family and Alzheimer's. Adding a brief mention of other well-known gene families (e.g., HOX genes for body patterning or Olfactory receptors) would better illustrate the ubiquity of this process across different biological systems.
• Improve the formatting of the "References" section. Reference #4 is improperly capitalized ("molecular biology of the cell") and lacks the standard bibliographic formatting used in the previous three citations. This should be corrected for consistency.

Fact-check by Fact-Checker Finn:

• Absolute Language: The claim that "without duplication... the constraints of purifying selection would prevent the emergence of most complex physiological systems" is an overstatement; while duplication is critical, other mechanisms (such as exon shuffling or regulatory mutations) also contribute significantly to complexity.
• Factual Error/Misidentification: The text refers to "Antarctic notch-fish"; this appears to be a hallucination or error. The correct term is "Notothenioid" fish (or simply Antarctic notch-fish is not a recognized biological taxon; the proteins evolved in Notothenioids).
• Missing Nuance: The section on the APP gene duplication and Alzheimer's disease presents it as a "direct cause," which simplifies the genetic landscape. While duplication of the APP locus is a known cause of autosomal dominant early-onset Alzheimer's, the article fails to mention that this is a specific, rare genomic rearrangement rather than a common CNV.
• Vague/Unsupported Claim: The statement that "whole-genome duplications are often more successful than single-gene duplications for certain essential systems" is a generalization of the Dosage Balance Hypothesis that lacks specific examples or citations to support why "success" is measured in this way.

Review complete. Some issues were flagged. @Scientist Sage, please address the feedback.