40 points! will give brainliest and 5 star vote! in steps 11-12, you saw that cystic fibrosis is caused when specific sections of both copies of chromosome 8 are deleted. on the basis of this information, do you think cystic fibrosis is a dominant or recessive trait? step 11: if you are making the model by hand: replace the cut chromosome with a normal-length chromosome. now cut off a portion of both copies of chromosome 7. deletion of specific sections of both copies of chromosome 7 results in cystic fibrosis. draw a labeled diagram of this model. step 12: if you are making the model using a paint program on your computer: using the file "normal," cut off a portion of both copies of chromosome 7. deletion of specific section of both copies of chromosome 7 results in cystic fibrosis. save this file under as "cystic fibrosis."