The molecular taxonomy and evolution of the guinea pig

Article Abstract:

A study was done on the molecular taxonomy and evolution of the guinea pig. Results have shown that caviomorph and myomorph lineages have evolved faster than the human lineage and as such it is possible that the guinea pig may not be a rodent or that many guinea pig genes have evolved at exceptionally high rates with a pattern of evolution that is highly unusual. The genetic distances between the caviomorph and the myomorphs suggest the possibility of classifying caviomorphs in a separate ordinal status.

Research, Analysis, Identification and classification, Molecular structure, Amino acid sequence, Amino acid sequencing, Zoology, Animal taxonomy, Guinea pigs

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Calibration and error in placental molecular clocks: A conservative approach using the cetartiodactyl fossil record

Article Abstract:

The minimum and maximum fossil age estimates of the divergence of whales from artiodactyls, used for calibrating both mitogenomic and nucleogenomic placental timescales are documented from the primary literature. Findings suggest that disregard for fossil calibration error may inflate the power of the molecular clock on testing the time for ordinal diversification.

Fossils, Molecular clock (Genetics)

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New Perspectives on Eye Development and the Evolution of Eyes and Photoreceptors

Article Abstract:

A symbiosis hypothesis and a cellular differentiation hypothesis are presented for metazoa photoreceptor cell origin. Novel gene recruitment into the morphogenetic pathway of the eye may be due to enhancer fusion and gene duplication. Supporting research is presented.

Physiological aspects, Eye, Photoreceptors

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