DNA precursor asymmetries, replication fidelity, and variable genome evolution

Article Abstract:

Replication-active deoxyribonucleoside triphosphate (dNTP) pools in T4 DNA synthesis were studied by the rII mutation reversion appproach. Result show that a localized, rapidly replenished minute quantity of hydroxymethyl-deoxycytosine triphosphate induces replication in prokaryotic systems. On the other hand, eukaryotic systems have a highly asymmetric normal dNTP replication pool, with deoxyguanosine triphosphate found at a subsaturating concentration. It is speculated that this assymetry contributes to the differential evolution rate of different genes in the same genome.

DNA, Deoxyribonucleotides, Deoxynucleotides

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Theoretical morphology of developmental asymmetries

Article Abstract:

Morphology of hard parts is the only evidence that fossil material provide and to understand the morphological organization of living and fossil organisms a theoretical tool called Morphospace is used. It is suggested that ontogenetic trajectories can be used as the generative functions that build morphospaces.

Science & research, Morphology (Biology), Morphology, Ontogeny

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The evolution of floral homeotic gene function

Article Abstract:

This review examines the role of plant MADS-box genes, encoding transcriptional regulators, in the developmental processes. Specifically, involvement of these genes in the angiosperm lineages and in the genetic diversification-led morphological manifestations are discussed.

United Kingdom, United States, Analysis, Physiological aspects, Genetic regulation, Morphogenesis, Gene amplification, Plant development

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