AS 91157 (2.5): Genetic Variation and Change

This achievement standard involves defining and using annotated diagrams or models

to describe and provide an account of, genetic variation and change. Genetic variation and change involves exploring the following concepts:

Sources of variation within a gene pool

Factors that cause changes to the allele frequency in a gene pool

Mutations as a source of new alleles

Independent assortment, segregation and crossing over during meiosis

Monohybrid inheritance to show the effect of co-dominance and incomplete dominance

Lethal and multiple alleles

Dihybrid inheritance with complete dominance

The effect of crossing over and linked genes on dihybrid inheritance

Natural selection

Migration

Genetic drift 

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