Chapter 12 : Variation part 1 Flashcards
Definition of variation :
Differences in characteristics between individual of the same species .
Importance of variation :
Enables a species to survive in a changing environment.
Enables a prey to survive from its predator.
Similarities between discontinuous and continuous variation :
Both variation show differences in characteristics between individuals of the same species.
Both variations are controlled by genes.
Differences between discontinuous and continuous variation :
Aspect : type of differences
Continuous variation: No distinct differences, shows gradual differences for a particular characteristic.
Discontinuous variation: Has distinct differences for a particular characteristic.
Differences between discontinuous and continuous variation :
Aspect : Intermediate characteristics
Continuous variation: Has intermediate characteristics
Discontinuous variation: No intermediate characteristics
Differences between discontinuous and continuous variation :
Aspect : Number of genes involved
Continuous variation: Controlled by several genes with several pairs of allele
Discontinuous variation : Controlled by a single gene with two or more alleles
Differences between discontinuous and continuous variation :
Aspect : Inheritable characteristics
Continuous variation: cannot be inherited as it is influenced by the environment.
Differences between discontinuous and continuous variation :
Aspect : Inheritable characteristics
Continuous variation: Cannot be inherited as it is influenced by the environment.
Discontinuous variation: Can be inherited as it is not influenced by the environment.
Differences between discontinuous and continuous variation :
Aspect : Causes of variation
Continuous variation: Caused by environment and genetic factors.
Discontinuous variation: Caused by genetic factors
Differences between discontinuous and continuous variation :
Aspect : type of variation
Continuous variation: Quantitative variation as it can be measured
Discontinuous variation: Qualitative variation as it can’t be measured
*either yes or no
Differences between discontinuous and continuous variation :
Aspect : Type of graph
Continuous variation: Normal distribution curve
Discontinuous variation: Discrete distribution
Differences between discontinuous and continuous variation :
Aspect :Examples
Continuous variation: Height, skin colour, weight, intelligent
Discontinuous variation: Ability to roll tongue, shapre of earlobe, blood group, fingerprint
Variation that are caused by genetic factors are called ?
Genetic variation
Factors that caused genetic variation:
a) Crossing over during meiosis
b) independent assortment of homologous chromosome
c) Random fertilisation
d) Mutation
Examples of environmental factors that causes phenotypic variation :
a) temperature
b) pH
c) light
