I know the answer, I just want to know why the answer is A. Please offer explana

Question

I know the answer, I just want to know why the answer is A. Please offer explanation

14. You discover two mutations, shorty and smalls, that cause oak trees to grow to only 5 feet tall. You cross true breeding shorty trees with true breeding smalls trees and get all normal height (tall) oak trees. What best explains your result? A. The two mutations are in different genes. B. The two mutations are in the same gene C. The mutations are incompletely penetrant. D. One mutation is dominant to the other. E. The mutations are incompletely dominant

Explanation / Answer

14) The gene for shorty and the gene for small in oak tree are in different genes. They are associated with normal alleles in their loci. So, when true breeding short and true breeding small trees are mated together, we will get only trees with normal height. Therefore, the answer for this question is option A.

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