a a bb bb bb bb bb d aa aa aa aa a 2 3 4 5 6 SolutionOption

a a bb bb bb bb bb d a-a a-a a-a a-a a 2 3 4 5 6

Option 1 is the correct answer. As in tetratype tetrad all genotypes are different. These include two parental and two recombinant. And this is indicated in the first arrangement in which a single crossover is present between the two linked loci and thus will form two parental and two recombinant spores.