The genetic erosion is the loss of genes from the gene pool due to certain factors such as deforestation, urbanization, shifting cultivation, damage of ecosystem and adoption of certain genetically uniform crop plants.
1. Deforestation : It results in depletion of plant and animal life throughout the world. Deforestation disturb the tribals and forest dwellers living in harmony with nature. It reduces natural population of plants and hence cause genetic erosion.
2. Reduction in crop varieties : As new varieties develop, old varieties are discarded. With this gene pool gets depleted. With development of high yielding varieties, local low yielding varieties are discarded. Such varieties and their genes can not be regained.