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Polymorphisms in continental and island populations of Drosophila willistoni.
Proc Natl Acad Sci U S A ; 68(10): 2480-3, 1971 Oct.
Article in En | MEDLINE | ID: mdl-5289881
A comparative study of genic allozyme and chromosomal polymorphisms in four continental (South American) and six oceanic island (West Indies) populations of Drosophila willistoni has been made. The pattern of genic polymorphism is closely similar in all populations. Although regional and local differences in gene frequencies are found, generally the same alleles occur at high, intermediate, and low frequencies in all populations. An average individual is heterozygous at 18.4 and 16.2% of its loci in the continental and island populations, respectively. By contrast, chromosomal polymorphism is sharply reduced on the islands compared to most continental populations, and some chromosomal inversions are more frequent on some islands than on others. The observations are not compatible with the hypothesis that most of the gene variants are adaptively neutral. Balancing natural selection is responsible for most of the genic polymorphism in natural populations of D. willistoni.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Polymorphism, Genetic / Drosophila / Enzymes / Gene Frequency / Genes Limits: Animals Country/Region as subject: America do sul / Caribe Language: En Journal: Proc Natl Acad Sci U S A Year: 1971 Document type: Article Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Polymorphism, Genetic / Drosophila / Enzymes / Gene Frequency / Genes Limits: Animals Country/Region as subject: America do sul / Caribe Language: En Journal: Proc Natl Acad Sci U S A Year: 1971 Document type: Article Country of publication: United States