The evolution of a new species by the large scale change in gene frequency so that the new species replaces the old rather than branching to produce an additional species.
(genetics) The first filial generation of seeds or animal offspring, which are usually vigorous and uniform. Produced by crossing two distinctly different parents.
An living thing such as an animal, a plant, a fungus or a microorganism; something that lives, as opposed to being non-living or dead; any thing that has life as its quality as opposed to state.
(biology) A species that normally lives and thrives in a particular ecosystem. This can include any species that developed with the surrounding habitat, and can be assisted by or affected by a new species.
(biology) A variation of the panspermia hypothesis that posits that life on Earth derived from degraded genetic material that originated from other planets
(zoology, chiefly entomology) The situation where interspecific (interspecies) mating fails to produce hybrids and thus reduces the fitness of the species involved.
(evolutionary theory) The hypothesis, in evolutionary biology, that a female animal's optimal choice among potential mates is a male whose genes will produce male offspring with the best chance of reproductive success, irrespective of the mate's capacity as a caregiver or any other direct benefits he can offer.
(biology) A theory suggesting that women have evolved to pursuit a dual-mating strategy, by forming long-term pair-bonds with men who are good providers, while securing high quality genes for their offspring via extra-pair copulation when they are ovulating.
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