Respuesta :

Jenirelle

Complete Question:

  1. A population of salmon dies out because they cannot find food.
  2. A zebra with a long mane moves into a population of zebras with short manes.
  3. A population of squirrels is separated by a mountain range and cannot interbreed.
  4. Two populations of rabbits are forced together after a flood.

Explanation:

3. A population of squirrels is separated by a mountain range and cannot interbreed.

Geographic isolation is the separation of populations by a physical barrier. This usually stops gene flow between the populations, leading to reproductive isolation in a process called allopatric speciation.

Further Explanation:

During the process of cell division, spontaneous changes within the genome can arise, called mutations. These errors occur when copies of the DNA within the cell are made; mutations may range from small changes called single nucleotide polymorphisms, to large scale deletions, and additions which span multiple genes.

These mutations form variants which become stable within a population, leading to the formation of separate, genetically distinct populations called species. Apart from allopatric speciation, new species arise through several other evolutionary mechanisms like:

  • peripatric speciation- like allopatric speciation, however, one group is much smaller, making the unique traits more notable, or distinct
  • parapatric speciation- sub-populations in a large geographic region evolve reproductive isolation by mating with those nearby, however they continue to undergo gene exchange along a common border region
  • sympatric speciation- absence of physical barriers which hinder gene flow; reproductive isolation arise through many forms of the same genes called polymorphisms

Learn more about mutations at brainly.com/question/4602376

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

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