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IB Biology HL A4.1.10 Hybridization barriers Question Bank

Practise IB Biology HL A4.1.10 by analysing behavioural barriers, mating compatibility and reproductive isolation in closely related populations.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Classify behavioural isolation when mating signals prevent females from accepting males of another group.

A4.1.10 (HL)—Barriers to hybridization question 1

[Maximum number: 1]

Two kinds of wolf spider rub specialized body parts together in order to produce distinct sounds to attract females. Females of both groups will only allow a male of the same kind to mate with them. It has been found through experimentation, however, that offspring can be produced from crossings between the two groups. What can be hypothesized?

I. The groups are reproductively isolated.
II. They could be the same species.
III. This is an example of behavioural isolation.

A

I only

B

II only

C

I and II only

D

I, II and III

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