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D3.2.1—Haploid gametes + fusion = diploid zygote

Haploid gametes fuse at fertilization to restore diploid chromosome number in the zygote and combine alleles from two parents in inheritance problems.

Syllabus
First assessment 2025
Objective
D3.2.1
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceMay 2018
Most common paperPaper1
Typical marks1

Common command terms

  • Identify

Recent exam appearances

May 2018Paper1 ["HL"] · TZ110[ 1 ]D3.2.1—Haploid gametes + fusion = diploid zygote
Practice this objective

Coverage 2018–2018 · Updated 16 Jul 2026

Concept essentials

  • Gametes are haploid so fusion can restore the diploid number.
  • A zygote receives chromosomes and alleles from both parents.
  • Fertilization connects chromosome number with inheritance across generations.
ConceptIB Biology HL