Which is the most common mechanism of genetic varisation in the poplulation of a sexually-reproducing organism

Which is the most common mechanism of genetic variation in the population of a sexually-reproducing organism 1. Chromosomal aberrations 2. Genetic drift 3. Recombination 4. Transduction

Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

Which is the most common mechanism of genetic variations in the population of sexually reproducing organism ?

Zygote in sexually reproducing organisms