Question

Ultimate source of variation is

• A. Mutation
• B. Sexual reproduction
• C. Genetic drift
• D. None of the above

Answer 1

Answer: (A)

Mutation

Mutations can alter single nucleotides or entire chromosomes. The ultimate source of genetic variation is random mutation i.e. changes in nucleotide sequences of DNA. They may involve only a single base pair or many as in chromosomal mutations. Mutation can change allele frequencies as well as introduce new alleles. Change in the allele frequency and introduction of new alleles are the basis of genetic variation occurring in any population.

So, the correct option is 'Mutation'.