B4 Flashcards
1
Q
Meaning of natural selection
A
Survival of the fittest
Genetic variation bc of diff in alleles rise thro mutations
2
Q
What things act as selection pressures?
How they affect an organism?
A
Predators
Competition for resources like food
Disease
They affect an organisms chance of survivi g and reproducing
Better Adapted to s pressures
Better chance of survival and breed
Useful allels passed on to nxt generation
Beneficial characterists become more common over ti.e
3
Q
Explain how bacteria shows evolution
A
Some able to resist antibiotic and reproduce
Better adapted to e and trait becomes common over time
4
Q
How do fossils provide evidence for evolution?
A
Arrange them in c order shows gradual changes in organisms
