Answer:
d.the total percentage of gametes with recombinant genotypes will be 50%.
Explanation:
True breeding yellow flowered plant with red tomatoes = YYRR
True breeding, double recessive plant for Y and R = yyrr
Crossing the two: YYRR x yyrr
F1 Progeny = all YyRr genotype with yellow flower and red tomatoes.
F1 gametes: YR (parental), Yr (recombinant), yR (recombinant) and yr (parental)
1/2 or 50% of the gametes have parental genotype while 1/2 or 50% of the gametes also have recombinant genotype.
Hence, the total percentage of gametes with recombinant genotypes will be 50%.
The correct option is d.