IB Biology SL A4.1.1 Evolution Question Bank
Practise IB Biology SL A4.1.1 by defining evolution as heritable population change and explaining how variation is shaped by natural selection.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Define evolution as cumulative change in the heritable characteristics of a population.
- Explain how variation, selection and reproduction change allele frequencies over time.
A4.1.1—Evolution as change in heritable characteristics question 1
[Maximum number: 8]
Explain how the process of evolution occurs.
a. evolution is «cumulative» change in population/species over time OR
change in allele frequency
b. a population has variations amongst the individuals
c. due to meiosis
OR sexual reproduction
d. due to mutations
e. certain variations give an advantage to some organisms over others in certain environments
f. populations/species produce more offspring than the environment can support
g. individuals of the species compete for the same resources
h. the better-adapted organisms tend to survive and reproduce OR less adapted organisms tend to die or reproduce fewer offspring
i. individuals «that reproduce» pass on their «heritable» characteristics/alleles/genes to their offspring
j. natural selection increases the frequency of «heritable» characteristics/alleles/genes of the better-adapted organisms
k. specific example described
Marking guidance:
Award [7 max] if no reference to heritable characteristics or alleles.
"Traits" is an acceptable alternative to "characteristic".
Accept "genes".
Example must be "described" to award marks.
8 max
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