The environment only has enough resources to support 250-300 of this organism.
It is important because that way you can group certain things, such as colors, size, shapes, etc.
Answer:
Reproductive barrier ⇒ isolation mechanism ⇒ seasonal or temporal isolation.
Explanation:
Reproductive barriers are isolation mechanisms that prevent mating between two or more species. The prezygotic mechanism avoids fertilization between individuals of different species, and the postzygotic mechanism avoids the zygote to develop and reach the adult stage.
Among the prezygotic mechanisms, we might find behavioral isolation, seasonal or temporal isolation, sexual isolation, gamete incompatibility.
Seasonal or temporal isolation occurs when individuals of different species occupy the same area, have the same reproductive behavior, and their gametes are compatible, but they do not get to mate because their reproductive seasons differ.
In the exposed example, after the speciation process, both bird species living together are not capable of mating because one of the species mates in the spring and the other one breeds in fall.
The answer that fits the blank is the term X-GAL. What is done in a recombinant DNA technology is that DNAs from two different organisms are joined together in order to create a new genetic combination. X-gal is part of gene cloning, therefore, it would be the best to become a selectable marker.
