Classification and reclassification: genetic evidence | Exit Quiz | Oak National Academy

The model shown in the diagram is an evolutionary ...

Answer explanation

The model shown in the diagram is an evolutionary tree.

According to this evolutionary tree, which two organisms are most closely related?

• A and B

• B and C

• C and D

• D and E

Answer explanation

Organisms A and B are most closely related.

Which branching point, P, Q, R or S, shows the most recent common ancestor of species A, B, and C?

• P

• Q

• R

• S

Answer explanation

Q is the most recent common ancestor of species A, B and C.

Which species is most closely related to species G?

• H

• I

• J

Answer explanation

Species H has no genetic difference to species G, so it is the most closely related to species G.

How many differences are there between the gene sequence of species G and that of species J?

Answer explanation

There are three differences between the gene sequence of species G and that of species J.

Which evolutionary tree shows the relationship between the species shown in the table?

• 
• 
• 

Answer explanation

Species G and H have the most similarities in their gene sequence and species I and J have branched from a common ancestor of G and H.