本题目来源于试卷: HL Topic A3.2 Classification and cladistics，类别为 IB生物学
[问答题]
8. Explain why the number of diffe-/ei :;3fcmv9 yng ehjrenc:6+eu 0y5us jhhg hruz5c o2r2es in the base sequence of DNA is used as an indication of how far in the past two species rhuzsg+ 2eyho5cj h25ur6:0u diverged.
参考答案: Differences in base sequences are caused by mutations.
Base sequences differences accumulate over time.
The greater the difference in base sequences between two groups, the greater the time period the time when the groups diverged. Evolution/changes in base sequences do not always occur at the same rate so time periods are only imprecise estimates.
本题详细解析:
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