IB Biology HL 3.1.2 Role of meiosis and gamete fusion Question Bank
Practise IB Biology SL/HL 3.1.2 by applying role of meiosis and gamete fusion 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
D3.1.2—Role of meiosis and gamete fusion question 1
[Maximum number: 4]
Members of a species typically all have the same number of chromosomes.
Explain the need for both fusion of gametes and meiosis in a sexual life cycle.
a. meiosis halves the chromosome number / allows production of haploid gametes/cells;
b. fusion of gametes/fertilization doubles (the chromosome number) / n+n=2;
c. meiosis prevents chromosome number doubling/conserves the chromosome number (between generations);
d. fusion of gametes brings together genes/alleles/chromosomes from two parents;
e. meiosis breaks up combinations of alleles/genes / segregation of alleles
OR
meiosis generates variation by independent assortment/crossing over;
f. fusion of gametes/fertilization/meiosis produces variation needed for natural selection/evolution/resilience/survivability/OWTTE;
4
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