BIOL 123 Lecture Notes - Lecture 30: Meiosis, Mutation Rate, Point Mutation
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Homologous & analogous structures because of common ancestry. Structures or other attributes in different species that resemble each other. Structures that are similar in function but not in structure & developmental & Differences arise by some genes being switched on or off at varying times during development. Figure 22. 18 anatomical similarities in vertebrate embryos. At some stage in their embryonic development, all vertebrates have a tail located posterior to the anus (referred to as a post-anal tail), as well as pharyngeal (throat) pouches. Descent from a common ancestor can explain such similarities. All life forms use approximately the same 20 amino acids to make proteins. All use atp as the primary form of cellular energy. All use rna & ribosomes to make protein. Figure 22. 19 tree thinking: information provided in an evolutionary tree. This evolutionary tree for tetrapods and their closest living relatives, the lungfishes, is based on anatomical and dna sequence data.
