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A change in genetic material. What are gene mutations? Negative, postitive, & neutral. Name three kinds of gene mutations... Positive. A beneficial mutation is... Curved red blood cells (answers will vary). Give an example of a negative mutation... Neutral. A mutation that has no negative or positive effect is... Factors that cause mutations. Mutagens are... Radiation, tobacco smoke, household chemicals, & pesticides. Name four examples of environmental mutagens... Replacing a mutated gene with a healthy gene. What is gene therapy? Be made incorrectly or with an incorrect shape. Changes to DNA may cause proteins to... A mutated gene. The white coat of the Kermode bear is due to... False, most mutations are neutral (have no positive/negative effect). True or false: Most mutations have a negative effect on the organism. It is not a neutral mutation, it is positive because it is beneficial to the plant. Is this a neutral mutation: A mutated gene that protects a plant from disease. Neutral. Errors in the DNA that do not cause harm or benefits are...