Equation 2 · One Gene, Forty Eyes: What Evo-Devo Did to the Convergence Story
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This equation states an equality: the expressions on both sides have the same value under the article’s assumptions. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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Symbol n
n is part of the quantity the equation computes from the expression on the right.
=
The expressions on both sides represent the same quantity under the stated assumptions.
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A raised number can be a power. When it is a label or bound, it selects a case or the upper limit of a sum; the formula’s structure distinguishes these uses.
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What the article says around this equation
Compounding that per-generation rate to reach the full 1,829 steps of one-percent change — equivalent to a single structure lengthening by a factor of just over eighty million — requires solving: . which gives n 363{,}992 generations [ 4 ] . Assuming a generation time of one year, common for small and medium-sized aquatic animals, the authors state the headline result directly: a camera eye could evolve from a light-sensitive patch in less than 364,000 years [ 4 ] . Measured against a fossil record that places the first animal eyes at roughly the early Cambrian, about 550 million years ago, that is short enough for the transformation to have run more than fifteen…
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Compounding that per-generation rate to reach the full 1,829 steps of one-percent change — equivalent to a single structure lengthening by a factor of just over eighty million — requires solving: . which gives n 363{,}992 generations [ 4 ] . Assuming a generation time of one year, common for small and medium-sized aquatic animals, the authors state the headline result directly: a camera eye could evolve from a light-sensitive patch in less than 364,000 years [ 4 ] . Measured against a fossil record that places the first animal eyes at roughly the early Cambrian, about 550 million years ago, that is short enough for the transformation to have run more than fifteen hundred times over in the time actually available [ 4 ] .
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