Despite the fact that clonal reproduction is a priori expected to be reproductively advantageous (Maynard-Smith, 1978; Bell, 1982), obligate asexual organisms are evolutionarily short lived and have ...

Parthenogenetic species are assumed to represent evolutionary dead ends, yet parthenogenesis is common in some groups of invertebrates particularly in those found in relatively constant environments.

In most vertebrates, males and females are believed to differ in terms of their investment in offspring. Dominance theory suggests that one way individuals of the sex with lower parental investment ...

Parthenogenesis means “virgin birth” or the production of offspring by one parent (a female) without genetic input from a male: the female’s egg is not fertilized by sperm. Thus, the offspring have ...

Getting the job done. A female Asian water dragon (Physignathus cocincinus) produced a daughter (left) without the assistance of a male. Skip Brown/Smithsonian’s National Zoo An Asian water dragon ...

Tychoparthenogenesis is characterized by low hatching success of unfertilized eggs from females of typically sexually reproducing species (White, 1973; Bell, 1982; Suomalainen et al., 1987).

Do Rare Males Retain Reproductive Function? While most animals reproduce sexually, some species rely solely on females for parthenogenetic reproduction. Even in these species, rare males occasionally ...

If research in mice holds true, men -- and hence, their manly services -- may no longer be needed. At least that's the indication of a new study boasting a scientific first: Mice that reached ...

At an agricultural research center in Czechia, a new species that doesn’t need a mate to reproduce was discovered. Street View Image from June 2019 © 2025 Google ...