In _____ selection, individuals with both extreme forms of a trait are at a selective advantage.
The spotted touch-me-not, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. Such an adaptation is favorable because it√
Student Answer: A. aids in the dispersal of the species.
Which concept was not included in Charles Darwin's theory of natural selection?
Student Answer: D. punctuated equilibrium
4. Define bottleneck effect and founder effect. Explain how each differs in its effect on microevolution. √
Bottleneck effect: Genetic drift due to a drastic reduction in population size. This is when a disaster occurs such as an earthquake which may reduce a population drastically. Founder effect: The type of genetic drift resulting from that of the parent population.
Because of prolonged drought, the trees on an island are producing nuts that are much smaller with thicker and harder shells. What will happen to the birds that depend on the nuts for food? Of the three general outcomes of natural selection, this example illustrates
They will have to adapt, and have offspring who have genetic differences which will improve their chances of survival. By producing enough offspring it may assure that the population doesn't die off before the adaptation takes place. Also, in order for this to happen the offspring must have some genetic or partially heritable traits that make it good at it's job. If not the birds will die.;
The example Illustrates: Directional Selection
Does sex play a role in evolution; explain why or why not as well as how?
Sex allows for a new combination of genes to be produced every generation; this increases the chance for survival and evolution, by allowing organisms to adapt to stressors in their environment and to breed offspring who are capable, and possibly improved organisms. Sexual reproduction increases genetic variation which improves a species chances for change over consecutive generations.
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