Genetic variation in a population of animals or plants depends mainly on which of the following?
a) the organism being haploidb) sexual recombinationc) migration of genes among the chromosomesd) mutation

The correct answer is: B) sexual recombination

Sources of genetic variation are different:

•Genetic mutations-random and rare events that occur within the genome and contribute to variations among individuals (or population). Mutations might be neutral, harmful or beneficial when they form new alleles favored by natural selection.

•Crossing over (genetic recombination)-event that occur during the meiosis (cell division that creates gamets)

•Random segregation during meiosis

•Random fertilization

•External source such as transposable genetic elements or retroviruses.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation: