1. In tomato, the round fruit （R) is dominant to p...

1. In tomato, the round fruit (R) is dominant to pear shape(r), while the single flower (B) is dominant to multiple flowers (b). Now using double homozygotes as parents, we get F1 generation. F1 testcrosses with the double recessive homozygotes, the following progenies were obtained: Round, single flower 34, Round, multiple flowers 214 Pear, single flower 216, Pear, multiple flowers 36 Question: (1) Are gene R and B linked？ (2) What are the genotypes of the two homozygous parents？ (3) If the two genes linked, what is their genetic distance？ If the two genes not linked, please write out the genotype of F1.