Linear mixed-effects models using S4 classes. That is, a female from a given replicate number was combined with a male from the same replicate number and another from a different replicate number all within the same selection regimee. We used two sets of allopatric populations of Drosophila melanogaster —one set of three populations evolving under male biased M operational sex ratio and the other set of three populations evolving under female biased F operational sex ratio, demonstrating high and low levels of SAC respectively 45. In the model, successful mating by a WR male was used as the response variable, selection regime was used as a fixed effect, and replicate population to which the female belonged nested within selection regime was used as a random effect using the following model: Drosophila santomea and Drosophila yakuba. Harvesting Sperm and Artificial Insemination of Mice.
Testes from white flies or from mutants that reduce testes size are harder to dissect and typically yield testes per hour.
Sperm fate and function in reproductive isolation in Drosophila.
Genetic basis of male sterility in hybrids between two closely related species of Drosophila. Thus, each combination had two treatments, e. There are at least two plausible reasons why M males have reduced sperm competitive ability when mated with allopatric M females. Since at least some accessory gland proteins are harmful to females, ejaculate- female coevolution should be antagonistic in nature. Thus in these populations, SAC seems to have resulted in postmating prezygotic RI between allopatric populations.