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IB DP Biology Mock Exam SL Paper 2 Set 2 - 2025 Syllabus

IB DP Biology Mock Exam SL Paper 2 Set 2

Prepare for the IB DP Biology Exam with our comprehensive IB DP Biology Exam Mock Exam SL Paper 2 Set 2. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam

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Question 

Differences can occur widely within a single species, such as domestic dogs (Canis familiaris).
(a) Provide a definition for the term species.
(b) Explain how karyotype analysis can help determine whether all of these dogs belong to a single species.
▶️ Answer/Explanation
Detailed solution

(a)
A species is a group of organisms that can interbreed (sexually reproduce) and produce fertile offspring.

(b)
Karyotyping is a technique used to investigate the number and type (e.g., size, banding pattern, centromere position) of chromosomes in a cell. A species has a characteristic number of chromosomes. Therefore, if samples from all the different dog breeds are karyotyped and found to have the same number and type of chromosomes, it would support the conclusion that they belong to the same species.

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