Variation

5.5 Variation
 
Type of variation
 

Variation

 
Continuous Discontinuous
  • 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
 
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
 
 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

 

Variation

5.5 Variation
 
Type of variation
 

Variation

 
Continuous Discontinuous
  • 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
 
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
 
 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