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Allele frequencies can change across the geographic range of a species according to climate, geological features, or direction in the range. For instance, a certain allele frequency might go up along with the elevation or down as you go south in the species' range. This systematic change in frequency is referred to as

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Answer:

Microevolution

Step-by-step explanation:

It is a systematic change in allele(gene) frequency in a population of living organisms over a certain period of time.This change maybe caused by :

1.Mutation-A change in genetic composition of an organism due to environmental factors such as the excessive exposure of an organism to radiation.

2.Natural selection-Which occurs when some organisms have to survive a changing environment as a result of the possesion of some beneficial traits.

3.Gene flow-which involves the transfer of genes from one population to another.

4.Genetic drift-which is a difference or variation in the genetic make-up among organisms of the same species.

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