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Notes
SPI 0807.5.3
Variation in Populations
Science
Variation in Populations
 Variation refers to a variety or diversity of traits
(different kinds) within any given population.
 Variation occurs due to natural selection and is the
result of the pairing of alleles from parental DNA
(dominant and recessive) and also from mutations.
Example: Look around at the other students. Notice the
unique traits that individuals have such as hair color,
height, eye color, skin color, etc.
This is an example of variation within the student population
 Likewise variations occur in nature in populations of
plants, animals, insects, fish, etc.
Notes
SPI 0807.5.3
Variation in Populations
Science
Variation in Populations
 Look at the picture below of the 5 dogs.
 They all belong to the same species (Canis Familiaris).
 Notice the variety of traits (different kinds).
This is an example of variation within a dog population
Question
SPI 0807.5.3
Variation in Populations
Science
resistant
Note: These percentages are the portions of the bacteria
populations that survived…not the amount that was killed!