Can someone please explain to me how to do this problem, it is driving me crazy.

Question

Can someone please explain to me how to do this problem, it is driving me crazy. I know that these answers are correct. Thank you.

The question is :  For each gamete, determine if it represents a recombinant (REC) or nonrecombinant (nonREC) gamete for the three pairs of loci: apricot and blunt (the A-B column), blunt and crimson (the B-C column), and apricot and crimson (the A-C column).

apricot is (aa) blunt is (bb) and crimson is (cc) I just really need to understand this :(

Parental lines AABBcc x aabbCC Testcross of Fi trihybrid AaBbCc x aabbcc 30A-BB-CA-C (ABCnon REC REC wild type apricot, blunt, crimson apricot, blunt Progeny phenotypes--- REC abc nonnonnon REC REC REC crimson blunt apricot, crimson blunt, crimson apricot non RECo REC REC non REC RECREC

Explanation / Answer

This is a trihybrid cross. In any cross, if the genes are not linked, 50% of the gametes are of parental type and another 50% are recombinant. If the genes are linked, the percent of parental genes increases and the percent of recombinant genes decrease. The gametes are parental means, no recombination occurred. The parental genotypes are, AABBcc and aabbCC. The gametes will be ABc (apricot, blunt) and abC (crimson), these are non-recombinant ones. The recombination between these alleles will give different gametes. For example, single recombination between c and C will produce ABC and abc, single recombination between A and a will produce AbC and aBc. Similarly double recombination produces Abc and aBC. (The gene order is ABC).

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