Freshwater planarians, found around the world and commonly known as "flatworms," are famous for their regenerative prowess. Through a process called "fission," planarians can reproduce asexually by ...

In order to evaluate the relative importance of asexual and sexual reproduction to the fitness of a clonal organism, matrix projection models were used to quantify the contributions of each of these ...

(Santa Barbara, Calif.) Why are most organisms sexual? The question of why most species reproduce sexually and others reproduce asexually has stymied biologists for years (particularly since asexual ...