4.7: Investigating diversity

Question 1

What 2 pieces of evidence do you need to construct a phylogenetic tree

Answer 1

1- comparisons of anatomy (living and extinct species)
2- comparisons of DNA - base sequences

Question 2

How can you use comparisons of DNA base sequences to see how closely related two species are

Answer 2

The two species that are most closely related have the fewest differences in DNA base sequence, implying that they share the most recent common ancestor

Question 3

What other comparisons can be made to see relationships between species apart from DNA base sequences

Answer 3

mRNA sequence and amino acid sequence of common proteins