AS2.5 Genetic Variation (External)

This externally assessed standard is worth 4 credits and is essential for
understanding at Level 3 and beyond.
You will cover a large amount of content and the teaching component will take
approximately 10 weeks of class time.
The following is a comprehensive list of all the key areas that you must cover for AS2.5. This topic will introduce a lot of new terminology and concepts.
understanding at Level 3 and beyond.
You will cover a large amount of content and the teaching component will take
approximately 10 weeks of class time.
The following is a comprehensive list of all the key areas that you must cover for AS2.5. This topic will introduce a lot of new terminology and concepts.
what you need to know!
Genetic variation and change involves the following concepts:
- sources of variation within a gene pool
- factors that cause changes to the allele frequency in a gene pool.
Biological ideas and processes relating to sources of variation within a gene pool are selected from:
- mutation as a source of new alleles
- independent assortment, segregation and crossing over during meiosis
- monohybrid inheritance to show the effect of co-dominance, incomplete dominance, lethal alleles, and multiple alleles
- dihybrid inheritance with complete dominance
- the effect of crossing over and linked genes on dihybrid inheritance.
Biological ideas and processes relating to factors affecting allele frequencies in a gene pool are selected from:
- natural selection
- migration
- genetic drift.
resources
animations
Practice papers
answers for papers
videos
Mutations I
Natural Selection Examples
Mutations II
Punnet Squares
Trait Variation
Linked Genes
Natural Selection
Genetic Drift