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Dihybrid Cross, Linkages, & Polygenic Inheritance (3.4/10.2)

Dihybrid Crosses and Gene Linkage

Calculate and predict the genotypic and phenotypic ratio of offspring of dihybrid crosses involving unlinked autosomal genes.

Distinguish between autosomes and sex chromosomes.

Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in an exchange of alleles.

Define linkage group.

Explain an example of a cross between two linked genes.

Identify which of the offspring are recombinants in a dihybrid cross involving linked genes.

Polygenic inheritance

Define polygenic inheritance.

Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin colour.

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