Variation

Question 1

Variation

Answer 1

Differences in organisms and species

Question 2

Interspecific Variation

Answer 2

Variation between different species
Used to identify and classify species

Question 3

Intraspecific Variation

Answer 3

Variation within a species
Used to identify differences between individuals in the same species

Question 4

Genetic Variation

Answer 4

Caused by the genetic material that an organism inherits

Question 5

Phenotypic Variation

Answer 5

Variation in phenotypes due to genome and interaction with the environment

Question 6

Why is sampling not always reliable?

Answer 6

Sampling bias
Chance

Question 7

Discontinuous / Discrete Variation

Answer 7

Distinct categories

Controlled completely by the organisms genotype
Not affected by environment

Controlled by single gene at single loci

Question 8

Continuous Variation

Answer 8

Feauture can have any value within a range

Polygenic inheritance (controlled by genes at many loci)

Affected by both the genotype and the environment

Question 9

Normal Distribution Curve

Answer 9

Smooth, continous curve
Bell-shaped
Mean, median, and mode are all equal

Question 10

Skewed Distribution

Answer 10

Mean, median, mode are not equal

Question 11

Standard Deviation

Answer 11

Measure of variation of data from the mean

Standard Deviation Bars
-Overlapping: unlikely to be significant difference
-Not overlapping: likely to be significant difference

If no SD bars, a valid conclusion cannot be reached

SD better than range because,
-reduces effect of anomalies
-can be used to indicate if a difference between results is significant