IB Biology HL A4.1.6 Speciation Question Bank
Practise IB Biology HL A4.1.6 by analysing reproductive isolation, gene-pool divergence and the timescales of speciation.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Trace how isolation, mutation and selection change gene pools until interbreeding is no longer possible.
- Distinguish gradualism, punctuated equilibrium and reproductive barriers in speciation evidence.
A4.1.6—Speciation by splitting of pre-existing species question 1
[Maximum number: 4]
The biological insights of Mendel and Darwin in the 19th century remain important to this day.
Outline the process of speciation.
a. speciation is the splitting of a species «into two species»
b. reproductive isolation/lack of interbreeding
c. isolation due to geography/«reproductive» behavior/«reproductive» timing
d. polyploidy can cause isolation
e. gene pools separated
f. differences in/disruptive selection cause traits/gene pools to change/diverge
g. gradualism / speciation/changes accumulating over long periods
h. punctuated equilibrium / speciation/changes over a short time period
4 max
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