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Selection of D. melanogaster for extreme developmental rates. II. Sexual and reproductive isolation due to hybrid inferiority

Élgion L.S. Loreto; Alice Kalisz de Oliveira

Departamento de Genética, Universidade Federal do Rio Grande do Sul, Caixa Postal 1953, 90001 Porto Alegre, RS, Brasil. Send correspondence to A.K.L. The present address of E.L.S.L. is Departamento de Metodologia do Ensino, Universidade Federal de Santa Maria, 97100 Santa Maria, RS, Brasil

ABSTRACT

D. melanogaster populations selected over 485 generations for fast (early) development and over 335 generations for slow (late) development, and a nonselected control population were studied for level of isolation. Incipient sexual isolation was observed when early and late females were crossed with late males. Greater receptivity was also observed in control females, possibly indicating that selection may have affected this trait in the females of the remaining populations. Reproductive isolation due to hybrid inferiority was detected in crosses involving late females, suggesting that cytoplasmic factors may be related to reduced productivity in crosses with early and control males. No such isolation was observed between early and control flies.

Keywords: selection; D. melanogaster; developmental; sexual; reproductive; isolation; hybrid; inferiority.

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