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A second chromosome major gene for developmental rate in Drosophila melanogaster

Alice Kalisz de Oliveira^I; Luiz Alberto dos Santos Monjeló^II; Antônio Rodrigues Cordeiro^III

^IDepartamento de Genética, UFRGS, Caixa Postal 15053, 91501 Porto Alegre, RS, Brasil. Send correspondence to A.K.O.
^IIDepartamento de Biologia, FUA, Campus Universitário, Estrada do Contorno, 69000 Manaus, AM, Brasil
^IIIDepartamento de Genética, UFRJ, Caixa Postal 68.011, 21910 Rio de Janeiro, RJ, Brasil

ABSTRACT

Drosophila melanogaster Oregon R lab stock was subjected to mass selection for many generations for slow and fast developmental rate. Crossing of homozygous "slow" females with heterozygous males (fast/slow) showed a bimodal curve for developmental rate, indicating a major gene effect (Oliveira and Cordeiro, Rev. Bras. Biol. 41: 635-644, 1981). This paper reports the experiments with discrete eclosion classes that located the gene for slow developmental rate on the second chromosome by use of an enzymatic as well as body markers. With a three point test the position was determined at 63.8. This mapping is requisite for a future molecular procedure to isolate, clone and sequence this "slow gene", as well as to study its action.

Keywords: Gene for developmental; Drosophila melanogaster.

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