Parthenogenesis is a natural form of asexual reproduction in which growth and development of embryos occurs without fertilization by sperm. The San Diego Zoo Wildlife Alliance on Thursday announced ...

University of Missouri researchers have shown how an all-female fish species called the Amazon molly defies the long-held belief that asexual reproduction is an evolutionary dead end.

Even back then, scientists were puzzled. Many prediction models suggested this fish shouldn’t survive beyond roughly 10,000 ...

Some animals can produce offspring from an unfertilized egg in an asexual reproduction process known as parthogenesis. When this is the standard process for a species it's said to be 'obligate' and ...

Sexual reproduction implies high costs, but it is difficult to give evidence for evolutionary advantages that would explain the predominance of meiotic sex in eukaryotes. A combinational theory ...

(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 ...

In a closer examination of how D. pachys reproduces, the research team found that, like many other asexual organisms, the process of making germ cells -- sperm or ova -- had been modified to prevent ...