GENETICS OF NATURAL POPULATIONS. XXVIII. SUPPLEMENTARY DATA ON THE CHROMOSOMAL POLYMORPHISM IN DROSOPHILA WILLISTONI IN ITS RELATION TO THE ENVIRONMENT

Chromosomal polymorphism in the saltans group of Drosophila II. Further study on D. prosaltans

“…Such average numbers are very low when compared with those detected in other species such as willistoni in which da Cunha et al (1959) could very frequently detect mean numbers of heterozygous inversions per individual varying from 6 to above 9. Such average numbers are very low when compared with those detected in other species such as willistoni in which da Cunha et al (1959) could very frequently detect mean numbers of heterozygous inversions per individual varying from 6 to above 9.…”

Three decades of studies on chromosomal polymorphism of Drosophila willistoni and description of fifty different rearrangements

“…This is the case for the southern borders of its geographical distribution, such as Uruguay, where the natural populations of D. willistoni still have a high level of polymorphism (Valente et al ., 2001, 2003). This said, the vast chromosomal polymorphism for inversions is one of the paramount characteristics of this species (Burla et al ., 1949; Da Cunha et al ., 1950, 1959; Townsend, 1952; Da Cunha and Dobzhansky, 1954; Valente and Araújo, 1985, 1986; Valente et al ., 1993; 2003; Rohde et al , 2005), and it appears that being chromosomally polymorphic is the rule for D. willistoni . Faced with this, it was a special challenge to choose one recent collected isofemale line of Drosophila willistoni to represent the species in the genome sequencing project ( Drosophila 12 Genomes Consortium, 2007).…”

THE CORRELATION OF CLIMATE AND HOST PLANT MORPHOLOGY WITH A GEOGRAPHIC GRADIENT OF AN INVERSION POLYMORPHISM IN DROSOPHILA PACHEA

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In 1967 Lewontin reviewed the correlations that have been made with environmental parameters on the degree of heterozygosity for chromosomal inversions within species (da Cunha et al, 1959;Carson, 1959;Dobzhansky, 1957) and pointed out that the difficulty in these attempts are caused in part because of the lack of a real understanding of the ecology of Drosophila. A considerable amount of information now exists on Drosophila larval breeding sites (Carson, 1971) and this knowledge has provided more insight into the role of ecology in controlling the accumulation of inversions in some species groups (Heed and Russell, 1971;Spieth and Heed, 1972).

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