BIOL 2905 Chapter Notes - Chapter 6.5: Microevolution, Macroevolution, Population Genetics
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22 Oct 2017
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Lo d1: individuals cannot just magically change and evolve. Through things such as natural selection, populations can begin to breed favored alleles and evolve that way. Evolution refers to change over generations, not over a couple months. So plants changing through seasons is not evolution, it is acclimation. Lo d2: importance of genetic variation in populations- it is a strong contributor to evolution. If there is no variation, there would be no favored/ advantageous traits and natural selection would have nothing to favor and pass on, so there would be no evolution and everything would stay the same. Macroevolution: descent of different species from a common ancestor over may generations. Changes in genetic characteristic of a population over time. Allele frequencies change in population over time, over several generations. Explain patterns, origin, maintenance and organization of genetic variation. Understanding mechanisms that cause allele changes in populations. Phenotypic variation: differences in appearance or function between individual organisms.
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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. |