What is the probability of getting double homozygous recombinants in the F2 generation of a Mendelian dihybrid cross?

If a cross was made between a plant having round and yellow seed plant with another plant having wrinkled, green seeded then the F2 generation shows the phenotypic ratio as 9:3:3:1 . The genotypic ratio is 1: 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1. In this 2/16 of the plants will have homozygous recombinants (rrYY and RRyy). Therefore, the ratio will be 2/16.