Which of the following is not a source of genetic variation?
a. mutations
b. sexual reproduction
c. lateral gene transfer
d. asexual reproduction

the one that is not a source of genetic variation is : D. Asexual reproduction In asexual reproduction, there is no fertilization process between male and female gender. Which mean the offspring that came from asexual reproduction would be exactly the same as its parent, without any chance of genetic variation

Genetic variations are the differences between individuals in a population, the most obvious types of genetic variation are: mutation, sexual reproduction and lateral gene transfer. These all involves genes mixing or changing. Therefore (d)asexual reproduction is not a source of genetic variation; this type of gene transfer is directly moving the genes of a parent to the offspring, therefore keeping the exact same gene pattern.