JAMB - Biology (2008 - No. 35)
Which of the following is a major cause of variation among organisms?
Inbreeding
Backcrossing
Sexual reproduction
Gene dominance
Explanation
The major cause of the evolution of organisms is sexual reproduction; during sexual reproduction, meiosis produces gametes, and during meiosis reshuffling of gametes occurs and brings variations. these variations are passed from one parent to the offspring.