Biochemical - analysing amino acid sequence of a common protein e.g. cytochrome c. Less amino acids in commom = less related. DNA hybridisation - single strand from different species paired up, bond where complementary. Then heated, longer time taken for DNa disassociation = more in common
Anatomical - smilar anatomical structure = more closely related. E.g. 5 digit limb common in almost all vertebrates, this is how we know dolphins are more closely related to us than fish - dolphins flippers are similar to our hands
Embryological - similar stages of pre-natal development due to common ancestor
Immunological evidence - similarities between antibodies in one organism and the antigens in another. If your blood was injected into a genetically similar species you would expected them to have the correct antibody
Behaviour - covers a wide range of traits from courtship rituals to vocalisation, facial expressions, feeding, hunting habits etc.
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