Ima just assume it is a true or false question and say true, as to make an experiment valid, only one variable has to be tested.
Answer:
Count the total number of boxes in your Punnett Square. This gives you the total number of predicted offspring. Divide the (number of occurrences of the phenotype) by (the total number of offspring). Multiply the number from step 4 by 100 to get your percent.
I think it’s E (microtubules) i can be wrong but hopefully this helped
