Speciation in monkeyflowers

Article Abstract:

The genetic analysis of two North American species of Mimulus, monkeyflower, differing only in pollinators, shows that the floral morphology separating these species is due to comparatively few genetic changes, contrary to the common beliefs. The advantages of a large variety of DNA markers for genetic analysis, through molecular technology, should allow for further studies on the genetic foundation for adaptation and speciation on other plant species from which hybrids can be produced.

North America, Natural history, Adaptation (Biology), Evolutionary adaptation

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Genetic mapping of floral traits associated with reproductive isolation in monkeyflowers (Mimulus)

Article Abstract:

Genome mapping of quantitative trait loci controling the speciation of two reproductively isolated, sympatric monkeyflower species shows that speciation is most likely a rapid process since only a few loci are involved in any one trait. The main phenotypic difference between the two species is pollinator preference by bumblebees or by hummingbirds with over 25% of the difference resulting from one focus.

Usage, Chromosome mapping, Mutation (Biology), Mutation, Flowers, Pollination

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Sperm competition between Drosophila males involves both displacement and incapacitation

Article Abstract:

In certain animals and insects the second male to copulate with a female will typically sire most of her offspring. The second-male sperm precedence has long been studied in Drosophila melanogaster, but its mechanism remained unknown. A study shows that males can both physically displace and incapacitate stored sperm from earlier matings, but only if the second male transfers sperm to the female.

Drosophila, Sexual selection in animals, Sexual selection (Natural selection)

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