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Bio January 23 - Bio January 23 Is the four-chambered heart...

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Bio January 23 Is the four-chambered heart homologous or analogous? Friday – Molecular Clocks o Most genetic changes not influenced by natural selection (Neutral theory) o Rate of genetic change relatively constant and can therefore be calibrated All mitochondria transmitted only by mothers o If you go back far enough, every human is related to a single ancestral female Origin of Life o What does it mean to be alive? o Influenza virus does not have own metabolism, causing argument of virus not being alive o Definition of Life a. Accurate replication (reproduction) b. Response to stimuli c. Metabolism (use and production of energy) d. Capable of information storage o Origin of Earth – 4.6 billion years ago o Single ancestral species a. Did life evolve (and fail) more than one time? b. If not, why not? o Earth was formed 4,600,000,000 years ago Spontaneous Generation o Idea that was popular in the 1600-1700’s o Living things come from the nonliving o
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