A female genotype, shown as abc / +++ produces 100 meiotic tetrads. Among these, 68 showed no cross over (NCO) events; 20 showed single crossover (SCO1) between a and b; 10 showed single crossover between b and c (SCO2) and 2 showed a double crossover (DCO) between a and b and between b and c. Of the 400 gametes produced, how many will be of the following types? Fill your answers in the table. (Source)
According to me, the answers should be,
However, the answers are $336, 40, 20, 4$ respectively. What am I getting wrong?