Explain how separation and contrasting selection pressures can cause populations to develop reproductive isolation.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2022–2026.
A new river channel separates a rodent population. Over many generations, the isolated populations diverge. Which explanation fits? A. Sympatric speciation because the populations remain separated by water B. Allopatric divergence with different selective…
Describe how the two species could have arisen from the ancestral population.
Which pairing describes a mechanism and a possible consequence in the formation of species? A. Increased interbreeding — guaranteed reproductive isolation B. Permanent mixing of gene pools — prevention of all allele-frequency change C. Reduced gene flow…
Discuss how fragmenting a forest into isolated patches can change population gene pools.
(a) Outline what makes DNA replication semi-conservative. (b) Describe how sexual reproduction generates genetic variation. (c) Explain how isolated populations can become separate species.
Enzymes, replication and evolutionary processes affect biological systems. (a) Outline, using graphs, effects of factors that influence enzyme activity. (b) Describe the functions of three named enzymes in DNA replication. (c) Explain speciation, including…
Two insect populations use different courtship signals and rarely mate in nature. Laboratory pairing can produce fertile hybrid offspring. Which interpretation is justified? A. The populations have no barrier to mating in nature B. Behavioural isolation can…
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