Which of the following is not true about gene mutation?

Explanation

This Biology question is asking which of the following statements is not true about gene mutation. The options are A, B, C, and D. Option A states that gene mutation introduces new traits into a population. This is true. Gene mutation can introduce new traits into a population, which can lead to genetic diversity. Option B states that gene mutation causes changes in the DNA. This is also true. Gene mutation can cause changes in the DNA sequence, leading to changes in the protein that is produced. Option C states that gene mutation is a source of new genes. This is also true. Gene mutation can create new genes, which can lead to new traits in a population. Option D states that gene mutation always affects the chromosome number. This is not true. Gene mutation can affect the DNA sequence without affecting the chromosome number. Therefore, option D is the correct answer. It is important to note that gene mutation can have both positive and negative effects. Some mutations can be beneficial, while others can be harmful. Mutations can also be inherited or acquired during an organism's lifetime. In summary, the correct answer to this Biology question is option D, as gene mutation does not always affect the chromosome number.