BIOLOGY 1M03 Lecture Notes - Lecture 3: Natural Selection, Null Hypothesis, Fossorial
15 May 2017
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Hypothesis: giraffes have long necks to provide access to food resources. Turns out that giraffes usually don t extend their necks during feeding, they feed lower or intermediate height. May not need the long necks for feeding (coming from the information finding that they feed lower than they can) An alternative hypothesis: is that giraffes evolved long necks because longer- necked males win more fights than shorter-necked giraffes and can then father more offspring. The alternative hypothesis is not mutually exclusive from the feed hypothesis. Males that have longer necks win more fights and foster more children. Eusocial and fossorial: one females breeds with 1-3 males and most individuals 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.
