3.33: Understand that Variation Within a Species can be Genetic, Environmental, or a Combination of Both

VARIATION: Difference in DNA Sequence of Individual offsprings from the same parent or species

VARIATION WITHIN SPECIES:

GENETIC FACTORS	ENVIRONMENTAL FACTORS
Diagram showing Variation caused by Genetics	Diagram showing Variation caused by Environment
Variation in species can be caused by genetic factors via inheritance of Alleles from Parents for certain characteristics	Variation in species can be caused by environmental factors that places pressure on organisms to adapt or change to aid their survival, allowing them to be better suited to their environment
EXAMPLES: Eye colour Hair colour Blood type Inherited disorders	EXAMPLES: Resource availability - presence of sufficient food, habitat and mates Environmental conditions - temperature, weather conditions or geographical access Biological factors - predators and pathogens)

BOTH FACTORS

EXPLANATION: Variation can be influenced by both genetic and environmental factors While genes determine the characteristics that are inherited by an individual, environmental factors can influence how the inherited characteristic develops

EXAMPLE: PLANTS Plants may inherit genes that allow strong growth However, if they do not receive sufficient mineral resources from the soil, this characteristic cannot be expresse     2.   CHILD Child may inherit genes for the tendency to be tall However, a poor diet during childhood will cause poor growth, preventing this characteristic from being expressed