variation and selection Flashcards
Variation
difference between individuals of the same species
causes of variation
-genetic variation
-environmental variation
environmental variation
differences between individuals that are not inherited but caused by the environment that the organism lives in
genetic variation
difference between individuals that are inherited and not caused by the environment
e.g of EV
scars,accent
e.g of GV
blood group,eye colour,hair colour
discontinuous variation
A characteristic of any species with only a limited number of possible values
discontinuous variation is caused by
genes only
continous variation is caused by
genes + environment
continous variation
traits that change gradually between species
E.G of DV
bloodgroup and gender
E.G of CV
height and weight
mutation
a change in DNA base sequence
gene mutation example
cyctic fibrosis,huntington disease
artificial selection
choosing particular organism with desirable charateristic to breed them together and repeat
natural selection
The process through which organism adapt and change
adaptive feature
inherited features that help organism to survive and reproduce in its environment
