True statement about transgenic mice is: (A) Developed from DNA inseion into feilized egg, (B) Have same genome as parents except one or more genes, (C) Identical genome to parent mice, (D) Produced by breeding over several generations
Answer is A. In 1974 Rudolf Jaenisch created the first genetically modified animal by inseing a DNA virus into an early-stage mouse embryo and showing that the inseed genes were present in every cell.