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Parthenogenesis is a mode of asexual reproduction in which offspring are produced by females without the genetic contribution of a male. Among all the sexual vertebrates, the only examples of true parthenogenesis, in which all-female populations reproduce without the involvement of males, are found in squamate reptiles (snakes and lizards). [1]
In species that use the XY sex-determination system, parthenogenetic offspring have two X chromosomes and are female. In species that use the ZW sex-determination system the offspring genotype may be one of ZW (female), [30] [31] ZZ (male), or WW (non-viable in most species, [33] but a fertile, [dubious – discuss] viable female in a few, e.g ...
Females in many lizard species have the choice to mate with or reject males. [14] Females spend energy in investigating a male's traits in order to determine if he is healthy and has good genes. [14] In the species Side-blotched lizard (Uta stansburiana), males chosen by females had 76 percent less ectoparasites. [15]
The New Mexico whiptail (Aspidoscelis neomexicanus) is a female-only species of lizard found in New Mexico and Arizona in the southwestern United States, and in Chihuahua in northern Mexico. It is the official state reptile of New Mexico. [2] It is one of many lizard species known to be parthenogenetic.
In snakes and lizards, morphological differences in the reproductive organs are believed to exist to help the male copulate with the female. Spikes and hooks are thought to assist the male in fixing the hemipenis in place during mating, and are made specifically compatible to the female of the species.
The desert grassland whiptail lizard (Aspidoscelis uniparens) is an all-female species of reptiles in North America. It was formerly placed in the genus Cnemidophorus. A common predator of the whiptail lizard is the leopard lizard that preys on A. uniparens by using ambush and stalk hunting tactics. [2] [3] [4] These reptiles reproduce by ...
The Nashville Zoo is the only AZA organization caring for crocodile tegus. Back in 2018, the Zoo acquired three female juveniles and raised them in an off-exhibit area. A juvenile male was then ...
The reproductive season for this species is year round. On average, their clutch size is around one or two eggs per reproductive cycle. Female water anoles reach sexual maturity at an earlier age than their male counterparts, and also have a smaller snout-anus length than males do at their sexual maturity.