DNA from a bacterial strain with genotype his- leu- thr- is transformed with DNA from a strain that is his+ leu+ thr+. A few leu+ thr+ transformants and a few his+ thr+ transformatns are obtained, but no his+ leu+ cells are observed. Which of the following statement is not supported by these experimental observations? a. ‘his’ and ‘thr’ are closer than ‘his’ and ‘leu’
b. ‘leu’ and ‘thr’ are closer than ‘his’ and ‘leu’
c. ‘his’ and ‘thr’ are closer than ‘thr’ and ‘leu’
d. these results do not tell anything