参考答案:
The traditional system and the cladistics approach both use morphological features.
The traditional system is based only on morphological differences and similarities but cladistics also uses differences of DNA sequences or the comparisons of the amino acid sequence of proteins.
The traditional method has a fixed hierarchy of taxa but cladistics uses unranked clades.
The different criteria for assigning an organism into a classiication group can lead to different hypotheses in both systems.
Morphological similarities of two groups could be based on convergent evolution rather than a closer evolutionary relationship and this can cause differences in the classification of species in both systems.
The objective data shown in DNA base sequences or by the amino acid sequence of proteins can allow cladistics to estimate when species diverged. The traditional system doesn’t do that.
In cladograms, the branches in a clade follow the evolvution from a common ancestor and can identigy convergent evolution, which traditional methods cannot.
Note: Any 4 or these points are needed to be awarded 4 marks. Accept other valid points
which are comparisons.
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