CourseCourseConceptConceptDocsDocuments

IB Biology HL A4.1.10 Hl Barriers to Hybridization Questions

Identify courtship-based behavioural isolation and interpret whether successful hybrid offspring show complete reproductive isolation.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify species-specific courtship signals as a behavioural prezygotic barrier that prevents mating.
  • Interpret successful offspring production after cross-mating as evidence that behavioural isolation does not completely prevent hybridization.

Learn this topic

Study A4.1.10 (HL)—Barriers to hybridization conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

All question bank results loaded