Unformatted text preview: heritable phenotypes in a population. • In text, modern example of Daphne finches—medium ground finch ◦ variable ◦ heritable-proportion of genetic control over trait in terms of inheritance ▪ measure heritability by comparing parents (midparent=avg of mom and dad) and kids ◦ vary in fitness =contribution of genes to future generations. ▪ Survival, reproduction, quality of offspring. ▪ '77 drought-less seeds, smaller and softer. Population of finches crashed. Fitness NOT random! Avg beak depth increased. ...EVOLUTION! • Can't always see natural selection at work ◦ Ex: longer horned lizards more likely to survive. ..natural selection?...
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- Spring '07