Answer:
Gene duplication can provide new genetic material for mutation, drift and selection to act upon, the result of which is specialized or new gene functions. Without gene duplication the plasticity of a genome or species in adapting to changing environments would be severely limited. the first mechanism, duplicated genes arise from the duplication of complete chromosomes, which correspond to what is called whole genome duplication (WGD) ). In that case, all chromosomes from a genome will be duplicated, leading each gene from the genome to exist in two copies.
Step-by-step explanation: