Monday, 20 May 2013

3.28 understand that variation within a species can be genetic, environmental, or a combination of both

Variation in a species is the differences between the members of a species.
Genetic is caused by what genes are inhereted.
Environmental is caused by some action after birth (e.g the sun giving you a tan.)
Some variation is a bit of both...


  1. Genetic variation is caused by genes. Eg:
    eye colour
    hair colour
    inherited disorders (for example, haemophilia)
    blood group

    An example of environmental variation could be that malnourished children have stunted growth.

    A combination of genetic & environmental variation accounts for:
    health (some are more likely to get certain diseases, but lifestyle also affects risk)
    sporting ability (genes may determine potential, but training is important too)

  2. This comment has been removed by the author.

  3. The Biology Syllabus has changed…

    Here is a New blog for the 2017 Syllabus:

  4. more at