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IB Biology HL A4.1.10 Hl Barriers to Hybridization Questions

Practise classifying habitat, temporal and behavioural isolation before fertilisation, and inviable or infertile hybrids after fertilisation.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Classify habitat, temporal and behavioural isolation as prezygotic barriers to hybridization.
  • Explain how inviable or infertile hybrids, such as mules, are postzygotic barriers.

IB Biology HL A4.1.10 Hl Barriers to Hybridization Questions 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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