Week5 Draft4

Certain species that defy expectations of sexual gender are important in helping biologists understand reproductive mechanisms. Not all species fit perfectly into the definitions of specific species concepts like the morphology or biological species concepts. The reproductive mechanisms for numerous species of lizards, fungi, and microbes differ drastically from mammalian mechanisms of reproduction. Certain species will reproduce sexually but do not fail to produce offspring even in the absence of the opposite sex. This is common in lizards that will lay eggs with no need for fertilization from the male counterpart. The viability of the offspring are high. Other traits that defy the biological species concepts include hybrids that are able to produce fertile and viable offspring with other hybrids but somehow, unable to cross with the parental species. These are instances in which the expectations from sexes and reproductive success are unable to fit perfectly into the human made concepts to understand nature.