Deleterious transposable elements and the extinction of asexuals

Article Abstract:

The genomes of virtually all sexually reproducing species contain transposable elements where the active elements transpose more rapidly but when inactivated by mutation or excision, their numbers can be kept in check. An important component of the evolutionary advantage of sex over asex lies in the ability of sex, despite facilitating the spread of deleterious elements within interbreeding populations and also in restraining their intragenomic proliferation.

Cell proliferation, Reproduction, Asexual, Asexual reproduction

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How and when did Arabidopsis thaliana become highly self-fertilising

Article Abstract:

The adoption of Arabidopsis thaliana as a plant model species has led to interest in how self-compatibility was lost so that this species became highly inbreeding. A new work studying polymorphism at two loci found strikingly low diversity at one of them, suggesting that the spread of a mutation in this gene was the cause of self-compatibility in an ancestor of Arabidopsis thaliana.

Genetic aspects, Arabidopsis thaliana, Molecular evolution

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Resistance and the jumping gene

Article Abstract:

The alteration in the metabolic enzymes capable of degrading pesticides or changes in the functionality of insecticide targets due to transposon insertion is discussed. Transposon alteration alters gene product function and thus causes resistance.

United Kingdom, Phylogeny, Insecticide resistance, Structure

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