D2.1.9—Meiosis as reduction division
Meiosis is a reduction division in which homologous chromosomes separate first, producing haploid nuclei after two divisions in gamete formation.
- Syllabus
- First assessment 2025
- Objective
- D2.1.9
- Level
- HL
Exam analysis
Chance of appearing12%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1
Typical marks1
Common command terms
- State
- Identify
- Outline
Scoring notes
- Common mistake
- Saying sister chromatids separate in meiosis I instead of homologous chromosomes.
Recent exam appearances
November 2025Paper1A ["HL"] · TZ319[ 1 ]D2.1.9—Meiosis as reduction division
November 2024Paper1 ["HL"] · TZ033[ 1 ]D2.1.9—Meiosis as reduction division
May 2024Paper2 ["HL"] · TZ13(a)(i)[ 1 ]D2.1.9—Meiosis as reduction division
November 2023Paper1 ["HL"] · TZ232[ 1 ]D2.1.9—Meiosis as reduction division
May 2022Paper1 ["HL"] · TZ112[ 1 ]D2.1.9—Meiosis as reduction division
Practice this objective
Coverage 2012–2025 · Updated 16 Jul 2026
Concept essentials
- Meiosis halves chromosome number to produce haploid nuclei.
- Homologous chromosomes separate during meiosis I.
- Sister chromatids separate during meiosis II.
- One DNA replication is followed by two meiotic divisions.
- Meiosis can produce four haploid cells from one diploid cell.