Reproductive characteristics of the flower-breeding Drosophila hibisci Bock (Drosophilidae) in eastern Australia: within-population genetic determinants of ovariole number

Article Abstract:

Genetic variation for ovariole number in the flower-breeding Drosophila hibisci Bock (Drosophilidae) was studied in populations from three different sites in the middle of the distribution of the species along the east coast of Australia. High heritability in populations and relatively large within-population variation for ovariole number show substantial microhabitat variation influences the trait, which is fitness-related.

Australia, Environmental aspects, Natural selection

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Are the same genes responsible for intra- and interspecific variability for sex comb tooth number in Drosophila?

Article Abstract:

Genetic aspects of intra- and interspecific variability for sex comb tooth number in Drosophila have been studied. Quantitative trait loci (QTLs) for which alleles segregated between two laboratory lines of Drosophila melanogaster were mapped. The two QTLs identified mapped to the X chromosome. They accounted for 8% of the between-line differences. A large number of small-effects genes probably modify sex combs.

Evolution (Biology), Origin of species, Quantitative genetics

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Population structure and host-plant specialization in two Scaptodrosophila flower-breeding species

Article Abstract:

A comparative analysis of population structure in the two species and tests for host-plant specialization in two Scaptodrosophila flower-breeding species are presented. The results emphasized the need for caution in studies where the presence of null alleles is inferred only from population data.

Science & research, Allelomorphism, Alleles, Host plants

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