Variation

• Variation is the differences in characteristics of individuals in a population.
• Examples of genetic variation are hair colour and eye colour.
• Two types of variation- genetic and environmental
• Causes of genetic variation are different alleles which lead to a different phenotype and new alleles due to mutations.
• There are normally alot of genetic variation in a population of a species
• Environmental variation is variation depending on surroundings.
• Examples of environmental variation is language in humans, colour of plants (depends on pH of soil and the amount of sun plant is receiving)
• Combination of genetic and env variation: height in humans, could have an allele for increase in height but height also depends on diet of calcium for bones.
• Some mutations in allele influence phenotype
• some mutations determine phenotype: eye colour
• Some mutations can be beneficial: mutation in rabbits to be resistant to disease