variation

• what are the three main factors that cause variation

  genotypes, environment and epigenetic modifications
• why is variation important to the survival of an organism

  so that they can adapt to environmental change
• What is continuous variation?

  A characteristic that can take any value within a range ,that can be affected by envronemnt
• give an example of continuous variation

  height
• What is discontinuous variation?

  When there are two or more distinct categories - each individual falls into only one of these categories, there are no intermediates
• give and example of discontinuous variation

  blood types
• what is meant by an epigenetic change

  changes caused by the environment
• what is meant by non-heritable variation

  these are environmental changes that will cause variation that cannot be passed on to offspring
• what is an example of non heritable variation

  tan or muscles
• explain how the environment could lead to a epigenetic change

  an environment factor could alter DNA methylaxon or histone proteins thus will alter gene expression