Read Similar Forms and Radiating Lineages
Adaptive radiation diversifies one ancestral lineage; convergence produces similar adaptations in separate lineages facing similar pressures.
Adaptive Radiation and Convergence is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Separate the two patterns
In adaptive radiation, descendants of one ancestral group diversify into different ecological niches. In convergent evolution, unrelated lineages independently acquire similar traits under similar selection pressures. Australian marsupials and placental mammals provide classic ecological analogies.
Use habitat and ancestry together
A region may contain separate radiations whose members occupy similar habitats; similar environmental pressures can then yield convergent forms. Similar appearance does not imply close ancestry.
OlympIQ exam lens
- ✓Radiation: one ancestor, many niches.
- ✓Convergence: separate origins, similar selective pressures.
- ✓Analogous mammals need not be close relatives.
Do not call every adaptive radiation convergent; check whether the comparison is within or between lineages.
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