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b5 (seed banks, fossils, bateria, evidence for evolution, biodiversity-…
b5
seed banks
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also help conserve genetic variation . For some species they store a range of seeds from plants with different characteristics ( so different alleles)
eg, in modern agriculture there was is little genetic variation in crops grown so they called all be easily wiped out by a pest but in traditional version of crops they may have alleles for pest resistance , if stored in a seedbank their seeds can produce crops that can cope with pests
fossils
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by putting fossils in chronological order, gradual changes in organisms can be observed. Provides evidence for evolution, shows how species have changed and developed over many years
bateria
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sometimes develop random mutations in their DNA which introduces new variants into the population - this can lead to changes in the bacterias phenotype ( eg. bacteruim could become less affected by a particular antibiotic - a substance designed to kill bacteria stop them from reproducing
the ability to resist antibiotic is a big advantage, bacteruim is better able to survive even in a place with antibiotics, so it lives for longer and reproduces each time
this leads to the resistant variant being passed on to offspring abd becoming more and more common each time aka natural selection
emergence of anticbiotic resistant bacteria provides evidence for evolution( as there is a change in the inherited characteristic) as bacteria reproduces so quickly, scientists can mobnitor evolution
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