【正文】
nt of life enzyme chemicals formed in the body a clone an anism which is geically identical to another Dolly 5 ? ? How many possible reasons for cloning are mentioned in the passage ? Fastreading Four para 4— 7 Carefulreading ? 1. who discovered the structure of DNA? When ? ? 2. What did Mendel understand in 1866 ? 1953 Watson and Crick He understood that both the parent plants had influenced the geic makeup of the new plant. Para 1 Carefulreading ? Find the expressions DNA 3. 3. 把它們