Sex linkage - Where a gene is carried on the X or Y chromosome., Pedigree chart - A family tree chart that shows the inheritance of genetic disorders., Autosome - Any chromosome which is not an X or Y chromosome, Autosomal linkage - Where 2 or more genes are carried on autosomes, Epistasis - Arises when the allel of one gene affects or masks the expression of another in the phenotype, Chi squared - A statistical test carried out to determined if there is a significant difference between the observed and expected frequencies from a genetic cross,

A Level Biology Chapter 17- 17.6

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