genetic variation

• • Mechanisms of sexual reproduction (meiosis and fertilisation) increase gene recombination (new combinations of alleles) leading to variation among individuals. This creates variability in a population (the amount by which individuals vary from each other genetically).
• • Mutations play important part in increasing number of allele for trait 
  • Greater variability improves ability of [opulation to adapt to changes in the environment resulting in an increased chance of survival