منابع مشابه
Rudimentary Organs and Genes: Evolution of the Visual System in Caecilians
As Darwin (1859 ppl43-146) noted, each major group of animals has evolved a visual system exhibiting unique adaptations to visual tasks. Caecilians are elongate, snake-like amphibians (the order Gymnophiona) that, except for the secondarily aquatic Typhlonectidae, are to some extent fossorial as adults. Caecilian eye morphology shows various degrees of rudimentation but the literature contains ...
متن کاملOn the Eyes of Male Coffee Berry Borers as Rudimentary Organs
The coffee berry borer, Hypothenemus hampei, is the most damaging insect pest of coffee worldwide. Like males in other species in the genus, male coffee berry borers have a lower number of facets in the compound eyes than females. The rudimentary eyes in male coffee berry borers could be an evolutionary response to their cryptic life habit, whereby they are born inside a coffee berry and never ...
متن کاملThe effect of dominant vestigial alleles upon vestigial-mediated wing patterning during development of Drosophila melanogaster
The vestigial gene product is required for the completion of wing development in Drosophila melanogaster. In the absence of vestigial gene expression, cells within the larval wing and haltere imaginal discs fail to proliferate normally thus producing adults with severely reduced wings. Of a large number of vestigial mutations that have been characterized, only two are currently known to exist, ...
متن کاملRudimentary Galois Theory
This paper introduces basic Galois Theory, primarily over fields with characteristic 0, beginning with polynomials and fields and ultimately relating the two with the Fundamental Theorem of Galois Theory. This paper then applies Galois Theory to prove Galois’s Theorem, describing the relationship between the Galois groups of polynomials and their solvability by radicals.
متن کاملStylet ( Vestigial Shell )
5 Sílvia Lourenço, Ana Moreno, Luís Narciso, João Pereira, Rui Rosa, Ángel F. González 6 Centro de Oceanografia, Laboratório Marítimo da Guia, Faculdade de Ciências, Universidade de 7 Lisboa, Avenida Nossa Senhora do Cabo 939, 2750-374 Cascais, Portugal 8 Departamento do Mar e Recursos Marinhos, Instituto Português do Mar e da Atmosfera, I.P.Avenida de 9 Brasília, 1449-006, Lisboa, Portugal. 10...
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ژورنال
عنوان ژورنال: Nature
سال: 1894
ISSN: 0028-0836,1476-4687
DOI: 10.1038/049247b0