Dna And Amino Acid Comparisons - Center Grove Schools (Page 3 of 3) in pdf

Dna And Amino Acid Comparisons - Center Grove Schools Page 3

9. There are 35 differences in the amino acid sequence of hemoglobin when you compare humans to 

birds. How long ago do you think humans and birds diverged from a common ancestor? (just 

estimate) 

Table C: Comparing cytochrome C of a human to other organisms

Organism 

# of Differences 

Chimpanzee 

Fruit Fly 

Horse 

Gorilla 

Rattlesnake 

Red Bread Mold 

Rhesus Monkey 

Screwworm Fly 

Snapping Turtle  

Tuna Fish 

Wheat 

Pigeon 

10. Based on the information in Table C above, which organism is the most closely related to humans? 

Explain how you know this. 

11. Based on the information in Table C above, which organism is the least closely related to humans? 

Explain how you know this. 

12. Other proteins can be used to establish degrees of evolutionary relatedness between organisms. 

Would you expect to find roughly the same number of differences in the amino acid sequence 

when comparing organisms? Explain your answer. 

Dna And Amino Acid Comparisons - Center Grove Schools Page 3