Educational Research Analysts

page 6

Anatomical and biochemical similarities may conflict

Biology: The Living Science
claims they do not conflict …
… but research data*
show that they may:
"Natural selection and evolution would predict that species which diverged from one another relatively recently in the history of life on Earth will share more genetic similarities than species that diverged from one another earlier. Because proteins are programmed by genes, a comparison of the amino acid sequences of their proteins would indicate the relatedness among species."
— p. 274, "Who's Related to Whom?," lines 1-6

Q: "As a rule, what general conclusion can you draw regarding how closely related species are and how their cytochrome-c amino acid sequences compare?"
— p. 275, "Analysis and Conclusions," no. 4

A: "The more closely related the species, the more similar are their cytochrome-c amino acid sequences."
— p. 275, right margin, "Answers to Analysis and Conclusions," no. 4, Teacher's Edition
ChartMyoglobin amino acid sequences which contradict anatomy-based phylogenies.

*Margaret O. Dayhoff, Atlas of Protein Sequence and Structure, Vol. V, Supplement 3 (Washington, D.C.: National Biomedical Research Foundation, 1978), p. 238.

previous page 5   table of contents