DARWIN. DESCENT WITH MODIFICATION All species of organisms living on Earth today are descended from ancestral species All species of organisms living.

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Presentation transcript:

DARWIN

DESCENT WITH MODIFICATION All species of organisms living on Earth today are descended from ancestral species All species of organisms living on Earth today are descended from ancestral species Species evolve over time Species evolve over time Darwin never actually used the term evolution Darwin never actually used the term evolution Explanation for the diversity of life Explanation for the diversity of life

NATURAL SELECTION The mechanism that causes species to change over time is natural selection The mechanism that causes species to change over time is natural selection In each generation, populations produce more offspring than there are adults In each generation, populations produce more offspring than there are adults Populations do not continue to grow in size Populations do not continue to grow in size Food and many other resources are limited Food and many other resources are limited Individuals within a population compete for resources Individuals within a population compete for resources

NATURAL SELECTION Individuals within all populations vary Individuals within all populations vary Many variations are heritable Many variations are heritable Some individuals will inherit characteristics that give them a better chance of surviving and reproducing Some individuals will inherit characteristics that give them a better chance of surviving and reproducing

NATURAL SELECTION Over time, the population changes as advantageous characteristics become more common generation after generation Over time, the population changes as advantageous characteristics become more common generation after generation

SURVIVAL OF THE FITTEST Fitness: the ability of an individual to survive and reproduce in it`s specific environment Fitness: the ability of an individual to survive and reproduce in it`s specific environment Survival of the Fittest: individuals with adaptations that increase their fitness survive and reproduce most successfully Survival of the Fittest: individuals with adaptations that increase their fitness survive and reproduce most successfully

PLEASE COMPLETE P307: 4, 5, 6 P307: 4, 5, 6