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The Journal of Heredity 1994:85(4):327-331
© 1994 The American Genetic Association 85:327-331

other

Effects of the Parents' Age on the Level of Polymorphism at the Adh Locus in Drosophila melanogaster: I.Effects on the Genic and Genotypic Segregation of the Offspring

G. Blanco Lizana, and J. A. Sánchez Prado

Departamento de Biologia Funcional, Area de Genética, Universidad de Oviedo Julián Claveria s/n. 33071 Oviedo, Asturias, Spain

Abstract

Several parameters (genetic and nongenetic) are involved in aJlele frequency changes and in the maintenance of the level of polymorphism at the Adh locus in Drosophila melanogaster. In this article, we have investigated the effect that parental age has on the genetic and genotypic segregation of the offspring Comparing the offspring from crosses between heterozygous individuals of different ages (young × young, young × old, and old × old), we observed an association between adult age and allele frequencies of the offspring. The offspring of the "older" parents have a greater frequency of the Adh-F allele compared to the offspring of "younger" parents However, this effect is not independent of the sex of parents. The age of the male has more importance than the female age. Furthermore, the duration of the parent egglaying period also affects the genie frequencies among the offspring. The frequency of the Fallele, in each cross, gradually decreases while the egg-laying period increases.


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