Using the information from problem 3, scientists do a further testcross using a heterozygote for height and nose morphology. the offspring are tall–upturned snout, 40; dwarf–upturned snout, 9; dwarf–downturned snout, 42; tall–downturned snout, 9. calculate the recombination frequency from these data; then use your answer from problem 3 to determine the correct order of the three linked genes.