Sperm Selection After Mating :: Biology

A small-arm of Background InformationWhat is pre- and post-copulatory sexual option? From the word copulatory, meaning to run in sexual intercourse, pre-copulatory sexual filling refers to the fe manlikes choice in selecting a mate before sexual intercourse takes place. Post-copulatory sexual option occurs within the distaffs reproductive track, and it describes the biological selection (whether due to sperm or the females biology) that results in the fertilization her eggs.why are guppies good subjects for research in this subject field? The most significant reason for using guppies in sexual selection research is because they casually participate in polyandry. This means that in disposition a female guppy will mate (willingly or unwillingly) with many males at a time, allowing for experiments to be conducted to see which males sperm fertilizes the most eggs.Why use contrived insemination? Before the use of artificial insemination, the results of such experimen ts were wispy and varied greatly. There was no way of controlling the males ejaculate sizes or thier specific sexual contact with the female guppies. By using artificial insemination techniques, these two variables can be controlled equal quantities of sperm from each male guppy can be isolated, and no sexual contact expect ever take place. The increased control over these variables makes it possible to shit reliable results that are directly related to postcopulatory processes. Introduction Sexual selection is a common facet of evolutionary biology that plays a recognise role in the mating choices of a variety of different species. competition between the males sperm as well as the choice of mate by the female factor into a winning copulation.This experiment examines the precopulatory and postcopulatory behavior of Poecilia reticulata , the guppy. Artificial insemination was used to separate the factors of sexual selection before and after sexual intercourse. Attra ctive males in the guppy creationdeemed attractive based on the female guppys relationship for themwere those with high levels of carotenoid coloration (orange, yellow, and red). Relative statures were also compared. The purpose of this experiment is to demonstrate, through artificial insemination, the role of postcopulatory sexual selection in a creation of guppies. If guppy females are partial to specific traits, the propagation of those traits will be evident. The Methods That Were Used Prior to insemination, the behavior of the guppies involved was analyzed and one adult, non-virgin female and two sexually immature fish were put in manifestation tanks.