Similari8es common evolu8onary ancestors closely

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Unformatted text preview: nds on the environment •  If the environment changes, the trait may no longer be beneficial Not All Differences are Adapta8ons •  Gene8c driS –  Random changes in the frequency of genotypes over 8me –  Independent of adap8ve evolu8on –  Most common in small popula8ons •  For example, forest fire resul8ng in founder effect Evolu8onary Rela8onships –  Despite the diversity in animal form and func8on, there are many similari8es •  Common evolu8onary ancestors –  Closely related species share more features than distantly related species –  Understanding evolu8on is necessary to understanding physiological diversity Factors Influencing Phenotype Figure 1.1 Why zebrafish? Hypoxia slows down growth and development Embryos (6 hpf) Nomoxia (6 mg O2/l) Hypoxia (0.6 mg O2/l) 12, 24, 48 hpf … 24 hpf! Head-trunk angle Head-trunk angle 140" 120" *! 100" 80" Normoxia" 48 hpf! From: Kimmel et al., (1995). Hypoxia" Hypoxia followed by re-oxygenation accelerates ! growth and developmental rates! Catch ­up growth This type of plasticity is found in all major domains of life. ! Kamei...
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