Which of the following is the most suitable medium for the culture of Drosophila melanogaster?

Linkage map of X-chromosome of fruitfly has 66 map units with yellow body gene(y) at one end & bobbed hair (b) at the other. The recombination frequency between y and b gene would be
1. 66%
2. > 50%
3. 50%
4. 100%

R and Y genes of Maize lie very close to each other. When RRYY and rryy genotype are hybridised, F2 generation will show
1. Segregation in 9: 3 : 3 : 1 ratio
2. Segregation is 3 : 1 ratio
3. Higher number of parental types
4. Higher number of recombinant types