IB Biology HL 2.2.9 Epigenetic tag removal Question Bank
Practise IB Biology HL 2.2.9 by applying epigenetic tag removal concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
D2.2.9 (HL)—Epigenetic tag removal question 1
DNA methylation profiles in zebrafish (Danio rerio) gametes were determined. The methylated areas were divided into three groups according to the amount of methylation: high, medium and low methylation.
Methylation of DNA in sperm and egg is removed immediately after fertilization. What is the reason for this?
A
Methylation allows RNA polymerase to join the promoter.
B
It is needed to form homologous pairs of chromosomes.
C
It allows expression of genes linked to early development.
D
Transcription of promoters only occurs in methylated genes.
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