IB Biology HL 4.1.11 Changes in allele frequency Question Bank
Practise IB Biology HL 4.1.11 by applying changes in allele frequency 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
D4.1.11 (HL)—Changes in allele frequency question 1
[Maximum number: 4]
If a wild population of cats contained both curled ears and normal ears, explain how the proportion of these two phenotypes could change in the population.
a. natural selection could change the proportion;
b. better sense of hearing with normal ears / other suggestion of selective advantage of one phenotype or the other;
c. greater chance of survival with better adapted phenotype;
d. survival to reproductive age/more reproduction of certain cats (with better adapted phenotype);
e. (ear type is) heritable/offspring inherit alleles (for adaptation) from surviving cats;
f. proportion (with adaptation) increases in population;
NB: The entire argument could be made using curled ears as the better adaptation.
Remember, up to TWO "quality of construction" marks per essay.
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