What are genotypes, An individual has the genotype shown

Question: An individual has the genotype shown below. Gene loci (A) and (B) are 22cM (map units) apart. Indicate all the possible proportions of expected offspring when a testcross is made with the below individual.

A b
_______________
a b

(Me talking): Okay the test cross would just be crossing it with ab/ab right? But then what? What are my genotypes?

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