5. does a reptile play the same role as a bird in the west nile virus?

Birds act as a reservoir and host for the West Nile Virus. It has an Important role in the transmission of West Nile Virus. Although reptiles can also act as host but less competent than birds. Non-vector transmission has been found to be important in some species but it is worth to investigate whether birds and mammals get infected by eating reptiles.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

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