Once speciation has occurred

Question

Quizplus · Accepted Answer

One of the key criteria for the formation of a new species is that it can no longer mate with the original parent population, as this is what ultimately leads to reproductive isolation and the development of distinct genetic and morphological traits. Once this has occurred, the new species will continue to evolve independently, although it is important to note that the process of evolution is not reversible in any meaningful sense. While certain traits may be lost or altered over time due to natural selection, genetic drift, or other factors, the overall pattern of divergence between the two species will persist, and they will remain distinct entities. The other options listed are not accurate descriptions of what happens after speciation has occurred: evolution is an ongoing process; viability and fertility of offspring depend on a wide range of factors and may vary between different species pairs; and mutations are always occurring and may or may not have a significant impact on the phenotype or fitness of an individual.

Once Speciation Has Occurred