3.29

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

Variation: differences in phenotypes of individuals (in how things appear)

It is possible to count or measure these differences and show them in graphic form

Individual’s phenotype = genotype + environment

V_population = V_genotype + V_environment

1)     Purely affected by the genotype – e.g. blood group

2)     Affected by both the genotype and the environment – genetic variation in genotype + modification by the environment to form a smooth curve – e.g. height in humans

3)     Purely affected by the environment, genes have no role to play and this cannot be inherited – e.g. home language

NUMBER 2: GENOTYPE AND ENVIRONMENT