BIO120H1 Lecture 16: Lecture 16- Tradeoffs and Compromises
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BIO120H1 Full Course Notes
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Two reasons why natural selection produces deeply imperfect organisms. Being good at x may necessarily imply being bad at y. Selection builds on what is already there, especially existing developmental programs. Chemical reactions don"t work if the solution is too salty or not salty enough. Getting rid of overloaded water is simple (kidneys, colons, etc) Getting water into the body is just consuming water. K-rat tactics for conserving water in hot, dry environments. Erect posture, bipedal; less heat gain from ground. Size of large mice, jump around on hind legs. Helps keep them from getting too conductive heat from the hot desert substrate (ground) If their body is farther from the ground its less radiative heat, standing on two legs allows for less points of contact. Elaborate kidneys with very long loops of henley (loses barely any water) Metabolic water sufficient (all animals with a regular lipid metabolism produces some metabolic water) Water produced from inside the water from fats.
