evolution Flashcards
4 proceses for evolutionary change
1-genetic drift
2-mutation
3-genetic flow (migration)
4- natural selection
3 sources for genetic variation
1-reproduction (genetic shuffling-crossing over)
2-mutations
3-gene flow
what can be the results of a mutation
neutral
harmful
beneficial
what can acause a mutation
1-Dna fails to copy sccurately
2-external influences
like chemicals and radiation
whats gene flow
the movement of genes from one population to the next
what is genetic drift
an event randomly kills off some of the population and changes the allelic frquency
what is natural selection
where on organism is better adapted to their environment and suvive to pass dfown their genes
in “survival of the fittest” what does fitness mean
ability of a genotype to leave offspring in the next generation
- ability to survive
- ability to find a mate
- ability to reproduce