In this exercise, you will compare the amino acid sequence from the aphid to the amino acid sequences of the other species to identify how similar they are. as a first step, you will compare the aphid sequence (acyrthosiphon) to a bacterial sequence (pantoea).

the sequences below show the first 60 amino acids of one polypeptide, using the one-letter abbreviations for the amino acids. an underscore indicates a gap inserted in a sequence to optimize its alignment with the corresponding sequence in arabidopsis.
acyrthosiphon (aphid) ikgsgv ggtrls kkgfqvevye
pantoea (bacterium) krtfvigagf gglalairlq aagiattvle
acyrthosiphon (aphid) knsynggrcs ihr_hnghrf dqgpsl__yl
pantoea (bacterium) qhdkpggray vwq_dqgftf dagptv__it

at how many positions are the amino acids the same between the two species?