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IB Biology HL D2.2.10 Hl Monozygotic Twin Studies Questions

Analyse methylation differences and twin concordance data to distinguish genetic, environmental and epigenetic effects in IB Biology HL D2.2.10.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • State that monozygotic twins begin with nearly identical genomes but can develop different methylation patterns.
  • Compare monozygotic and non-identical twin concordance data to assess genetic contributions while recognizing environmental influence.
  • Analyse concordance or percentage data and state limits on conclusions about genetic causation.

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Study D2.2.10 (HL)—Monozygotic twin studies conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D2.2.10 Hl Monozygotic Twin Studies Questions question 1

[Maximum number: 1]

What is the difference between the DNA of adult identical (monozygotic) twins?

A

Order of genes

B

Sequence of nucleotides

C

Methylation pattern

D

Ratio of complementary base pairs

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