On an island off the coast of Australia, differences in floweringtime result in the reproductive isolation of two species of closelyrelated palm.Finches colonized the Galapagos Islands only once. Within asingle island, many species are derived from a singlecolonizing species.During the last Ice Age, pupfish inhabited large lakes in theSouthwestern United States. As these lakes dried, pupfishbecame isolated in small lakes.Meadowlarks, which are found across the United States, aredivided into Western and Eastern species. The two species aresimilar, but behavioral barriers discourage matingbetween species.The Bering Sea land bridge once united Alaska and Russia.Mammals, such as caribou, traveled across this bridge until sealevels rose and flooded it.Giraffes live across the African continent. Differences in thecoat pattern may discourage breeding between northern andsouthern populations. Each of the examples describes either a speciation eventor potential speciation event. Place each scenario underallopatric, parapatric, or sympatric speciation.AllopatricspeciationParapatricspeciationSympatricspeciation

BASIC INFORMATION SPECIATION It is the process in which new are evolved from the species which are already existing. It is of various types as follows; ALLOPATRIC - It is due to geographical barrier. SYMPATRIC - It happens when a part of population separates from the parent population becomes reproductively isolated and do not mate with the parent population within the same geographical area. PARAPATRIC- This happens when a population of a species is introduced into a new habitat. No physical barrier is there. CLADOGENESIS- This includes formation of two or more species from single species. ALLOGENESIS - This is the reverse of cladogenesis in which one species is formed from two or more species. ANAGENESIS - It happens because of the piling up of the variations. ANSWER ALLOPATRIC SPECIATION PARAPATRIC SPECIATION SYMPATRIC SPECIATION Finches colonized the Galapagos islands only once. Within a single island many species are derived from a single colonizing species. During last ice age , pupfish inhabited large lakes in the southwestern united states. As these lakes dried, pupfish became isolated in small lakes. On the island of the coast of Australia differences in flowering time result in the reproductive isolation of two species of closely related palm Meadowlarks which are found across the united states, are divided into western and eastern species. The two species are similar but behavioural barriers discourage mating between species. The Bering sea land bridge once united Alaska and Russia. Mammals, such as caribou, traveled across this bridge until sea level rose and flooded it. Giraffes live across the African continent. differences in their coat pattern may discourage breeding between northern and southern populations.