BLG 144 Chapter Notes - Chapter 24: Goose Bumps, Geologic Time Scale, Natural Selection

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ceruleangoat169

8 Mar 2017

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Chapter 24 | evolution by natural selection | biology. Lamarck proposed an idea in 1809 that species change through time. generated and then evolved into better and more complex creatures: lamarck said that as the environment changes that the the creature will change over time. Also the phenotypes will be passed on to the offspring: darwin claimed that instead f being unimportant or an illusion, variation among individuals in a population was the key to understanding the nature of species. Biologists refer to this view as population thinking: this was important for 3 reasons, it overturned the idea that species are static and unchanging, it replaced typological thinking with population thinking, it was scientific. It proposed a mechanism that could account for changed through time and made predictions that could be tested through observation and experimentation. 24. 2 the pattern of evolution: have species changed through time: darwin described evolution as descent with modification.

Related Questions

Which statement about evolution by natural selection isfalse?

Natural selection allows organisms with higher fitness toreproduce more successfully.

Natural selection favors those traits that confer higherfitness in the environment.

Natural selection is a random change in characteristics of apopulation over generations.

Evolution by natural selection affects populations oforganisms, not individual organisms.

An organism's fitness depends on its _____.

ability to survive and reproduce

ability to swap genetic material with other organisms

physical size

ability to mutate

population

Consider the heavily armored stickleback fish population thatcolonized the lake. If all the individuals in that population weregenetically identical, what do you predict would happen when theycolonized the freshwater lake?

The population would increase, as it has increased foodresources.

The population would evolve through natural selection to bebetter adapted to its environment.

The population would decrease due to more juvenile fish beingeaten.

No answer text provided.

Which of the following are adaptations?

Thicker beaks on finches that allows them to eat large seeds,when large seeds are the most abundant.

Less armor on stickleback fish in freshwater that allows themto grow faster to avoid predation.

More armor on stickleback fish in the ocean that prevents themfrom being eaten by larger predators.

None of the above.

All of the above.