The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as? by Sunday | May 14 | Biology WAEC | 0 comments A. migration B. mutation C. mitosis D. meiosis Correct Answer: Option B B. mutation Users Also Read These:The expression of a gene in the phenotype…The change in the genetic makeup of an organism…The name given to a sudden change in a gene or…The process which ensures that the chromosome number…The structure that joins the two strands of a…