Ascientist is studying the inheritance of two characteristics in plants: red flowers (rr and rr) , which are dominant to yellow flowers (rr) , and green leaves (gg and gg) , which are dominant to yellow leaves (gg) . she crosses a double heterozygous (rrgg) with a double recessive (rrgg) , and expect to see a 1: 1: 1: 1 ratio in the offspring. instead, she sees these results: genotype rrgg rrgg rrgg rrgg predicted outcome 500 500 500 500 actual outcome 900 900 100 100 which phenomenon would she hypothesize accounts for the pattern she sees? crossing-over respiration cytokinesis independent assortment