BIOLOGY 1M03 Lecture Notes - Lecture 3: Trilobite, Limb Development, Rhagoletis
16 Jan 2017
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Document Summary
Tree of life; molecular data and domains of life. Evidence for evolution: extinct species, fossils, ancient dna, vestigial traits, transitional forms, observed examples of speciation. Hypothesis: giraffes have long necks to provide access to food resources. Prediction: giraffes should eat food that are high in trees: most times the eat bushes and trees at a moderate height (don"t extend their necks) An alternative hypothesis (that isn"t really mutually exclusive from the feeding hypothesis) is that giraffes evolved long necks because longer-necked males win more fights than shorter-necked giraffes, and can then father more offspring. Eusocial and fossorial: one female breeds with 1-3 males, and most individuals (male and female) spend their entire lives in the colony (20-300 individuals) working but not breeding. If the queen dies or is removed from the colony, females may fight to the death to become the new queen.
