本题目来源于试卷: SL/HL Topic D1.3 Mutation and gene editing，类别为 IB生物学
[问答题]
8. Suggest two hypotheses for the pregq(bb:c7 kblq; j dra()x/2dzt(a2ebsence in mr;cl;d6 :ji9k nylu:ddf2u- iany species of highly conserved DNA sequences, thr2:kd-di f yu :c ijnl9l;u6d;at have changed very little during evolution.
参考答案: Highly conserved sequences are almost identical DNA sequences found in many species over long periods of evolution. The sequences could be in protein coding genes essential for biochemical processes that many species need. The sequences could be in genes to produce the enzymes to control a process (common to these species.) Another hypothesis is that there may be slower rates of mutation of certain genes.
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