Answer:
Mutations
Step-by-step explanation:
Mutations are the sudden and random changes in the genome of the organisms. A mutation can alter a genetic trait by changing the gene sequence. Radiations such as x-rays, gamma rays, alpha particles, ultraviolet radiation, some chemical substances like bromine, etc. can cause mutations. Asexual reproduction produces the progeny that is genetically identical to the parent. However, any exposure of the progeny of the asexual reproduction to certain mutagen can cause genetic variations in it and can make it genetically different from the parent.