Unformatted text preview: versity of living organisms on the planet.
(a) Explain THREE of the following processes or phenomena, using an appropriate example for each.
· adaptive radiation
· population bottlenecks
· growth of the human population
(b) For each process or phenomenon you selected in (a), discuss its impact on the diversity of life on Earth.
One point for each definition, example, impact and explanation.
Definition Example mutation change in DNA adaptive
radiation multiple species from 1
ancestor polyploidy more than 2 complete
chromosome sets population
bottlenecks sudden/drastic decrease
in population size
(usually natural) deletion/insertion
animals (rare e.g., fish,
northern elephant seals growth of
population near carrying capacity
evidence from age
pyramid rapid increase –
slow growth - U.S.
no growth - Italy Impact on
diversity of life
increase increase decrease decrease Explanation altered proteins
raw material for selection
co-existence of species
development of new species
representative of original
smaller gene pool
Use of resources leads to
extinction of other species Copyright © 2003 by College Entrance Examination Board. All rights reserved.
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