Transcription 1
DNA unzips
2
RNA polymerase adds correct nucleotides to make RNA from the
"DNA" blueprint
3
mRNA is fully synthesized and ready to go out into the cytoplasm
4
DNA reattaches together

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands