Variation

Variation

5.5

Variation

1.

Continuous	Discontinuos

Variation with intermediate Characteristic can be measured Can be represented in histogram or normal distribution curve Determined by environment factors and genetic factors Examples: Height	Variation without intermediate Characteristic cannot be measured Can be represented in bar graph Determined by genetic factors Example: Ability to roll tongue

2. Factors that cause variation

Genetic Factor	Environmental Factor
Crossing over between homologous chromosomes during meiosis Independent assortment of chromosomes Random fertilisation between gamates Chromosome and gene mutation	pH Sunlight Temperature Water Climate Nutrition

3. Importance of variation

Enables the organisms to adapt themselves to their environment
Enables us to easily differentiate and recognise each individual
Allows natural selection
Helps organisms to camouflage to protect themselves from predators