BIO152H5 Lecture Notes - Lecture 10: Gene Flow, Sickle-Cell Disease, Parasitism
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Darwin"s 2 interferences from his observations: individuals with advantageous heritable traits survive best and produce more offspring: these individuals are not a random sample of the population, the unequal survival and reproduction of individuals . Natural selection occurs when certain individuals with certain advantageous traits produce more offspring than do individuals without those traits. These selected traits (alleles) will increase in frequency in the population over time. Change in allele frequencies (genetic composition) of a population over time. The genetic contribution of an individual to subsequent generations relative to the contribution of other individuals in the population. Heritable trait that increases an individual"s survival and reproduction in a particular environment relative to individuals lacking that trait. Nature or the environment determine which individuals in a population are more fit. Orchid from madagascar with exceptionally long floral tube - 11 years later we noticed a night moth that has 11 inch tongue to reach the nectar.
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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. |