A part of the amino acid sequence in Cytochrome-C protein from 6 different speci

Question

A part of the amino acid sequence in Cytochrome-C protein from 6 different species is given in the table. Rank the organisms from 1 to 5 according to the similarity of the organism to human: based on the similarity between the cytochrome C aminoacid sequences, 1 being the closest to human. It is largely agreed that the greater the number of amino acid (or nucleotide) differences between a given pair of organisms, the further apart they are in evolution. On the other hand, if two organisms show very few differences, they are likely to be closely related. With the given information in the table and your ranking of organisms, do you think this ranking gives definite information on how further apart the organisms are in evolution? Why/why not? Human DVEKGKKIFIM Silkworm moth NAENGKKIFVQ Chicken DIEKGKKIFVQ Rhesus monkey DVEKGKKIFIM Bullfrog DVEKGKKIFVQ Tuna DVAKGKKTFVQ

Explanation / Answer

Human                                    DVEKGKKIFIM

Rhesus Monkey(1) DVEKGKKIFIM

Bullfrog (2)                              DVEKGKKIFVQ

Chicken (3) DIEKGKKIFVQ

Tuna (4)                                  DVAKGKKTFVQ

Silkworm moth (5) NAENGKKIFVQ

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