You may be wondering why you would use amino acids when you could look at DNA or mRNA; it is often easier to find and isolate proteins from cells than it is to isolate DNA or mRNA.However, DNA or mRNA analysis is often more powerful because genes for the same protein may have slightly different base sequences in different species.
Differences in DNA sequence data show how much time has passed since species diverged from each other, enabling the relationships between species to be established
The body shape of sharks/dolphins and the wings of butterflies/bats are both examples of analogous structures
A cladogram showing humans and other primates
转载自ssavemyexams
© 2024. All Rights Reserved. 沪ICP备2023009024号-1