IB Biology SL A4.1.7 Reproductive Isolation and Differential Selection Questions

Reproductive isolation reduces gene flow, allowing populations to diverge. Geographic separation and different selection pressures can drive speciation; chimpanzees and bonobos illustrate river-linked isolation and divergence.

Exam points

Explain how reproductive isolation reduces gene flow and allows populations to diverge.
Explain how geographic separation and different selection pressures can drive speciation.
Use river-linked isolation and divergence of chimpanzees and bonobos as an example.

[Maximum number: 3]

Chimpanzees and bonobos are different species of primate. It is thought that neither species can swim. The map shows the relative locations of chimpanzees and bonobos in Africa.

Figure for Question IB Biology SL A4.1.7 Reproductive Isolation and Differential Selection Questions question 1 — IB Biology SL

Evidence suggests that the level of the Congo River was lower during one period in the past. At this time, chimpanzees could have migrated across.

Explain how bonobos could have evolved from chimpanzees by speciation.

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IB Biology SL A4.1.7 Reproductive Isolation and Differential Selection Questions question 1