1) Compare human mitochondrial DNA to extinct Neanderthal mitochondrial DNA. Perform pairwise alignment with blast2 and record the percent nucleotide identity.

2) Are crocodiles more closely related to turtles or to birds? Find the answer using PubMed. Then choose 2 genes from each species and compare using blast2. Record nucleotide identities.

3) True or false: Two proteins that share 30% amino acid identity are 30% homologous.

4) A quagga is an animal that is now extinct. The last one died in a zoo in the late 1800's.  Use blast2 to find out if the quagga is more closely related to a donkey or a zebra.