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WAEC Biology 1988 Question 57

Question 57

Chromosomes, DNA and Sex Linkage

Which of the following is not true about gene mutation? It

  1. A.introduces new traits into a population
  2. B.causes changes in the DNA
  3. C.may have unnoticeable effect on the phenotype
  4. D.always affects the chromosome number
  5. E.is a source of new genes
Show the answer and explanation

Answer: D (always affects the chromosome number)

Explanation

A gene mutation changes the DNA of one gene; it does not change the number of chromosomes.