Asexual reproduction produces genetically identical offspring and sexual reproduction creates variation in the offspring. When the environment changes and it affects the asexual offspring it will affect all identical copies whereas since the sexual offspring have more variation, they are more likely to survive.
The random genetic combinations during chromosome crossover during meiosis
SparkNotes: Viruses: Viruses<span>www.sparknotes.com/biology/microorganisms/viruses/summary/</span>
