CAIE A-Level Biology A2 17.1.1 Genetic and Environmental Variation Questions
Explain genetic and environmental variation using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain genetic and environmental variation.
CAIE A-Level Biology A2 17.1.1 Genetic and Environmental Variation Questions question 1
[Maximum number: 3]
Variation exists in populations of a species and this may provide the opportunity for evolution to occur.
Phenotypic variation exists in many forms and has a number of possible causes.
Describe the main factors that are the cause of phenotypic variation.
1 genetic / genotype / alleles
or
example ;
mutation / crossing over / independent assortment / random fertilisation / random mating
2 environmental
or
example ;
climate / disease / food availability / soil pH / selection pressure
3 combination / interaction, of genes and environment or
example ;
gene (expression) is modified by environment
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