The current cladograms are different from cladograms created in 1970s because of phenotype and trait were used then while DNA sequences are used now.
In biology study, a cladogram refers to an evolutionary tree that diagrams the ancestral relationships among organisms.
In the 1900s, the cladograms were drawn based on similarities in the phenotypes or physical traits among organisms.
But now, the similarities in the DNA sequences of organisms are ued to draw the cladograms.
In conclusion, the current cladograms are different from cladograms created in 1970s because of phenotype and trait were used then while DNA sequences are used now.
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