Article
Evidence for repeated loss of selective constraint in rhodopsin of amblyopsid cavefishes (Teleostei: Amblyopsidae).
Evolution; international journal of organic evolution - 1 Mar 2013
Niemiller Matthew L, Fitzpatrick Benjamin M, Shah Premal, Schmitz Lars, Near Thomas J
Abstract excerpt
The genetic mechanisms underlying regressive evolution-the degeneration or loss of a derived trait--are largely unknown, particularly for complex structures such as eyes in cave organisms. In several eyeless animals, the visual photoreceptor rhodopsin appears to have retained functional amino acid sequences. Hypotheses to explain apparent maintenance of function include weak selection for retention of...
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