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.

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: