University:
High School
Course:
High School Biology
Academic year:

2023
Views:

78

Pages:

3
Author:

BugDourorawsy50

Natural Selection and Evolution Questions: 1. Populations can have variety despite being made up of the same species. If a population has different expressed traits, this can be due to different inherited alleles. The frogs below are the same species, but they have different shades of green based on their inherited alleles. In a particular environment, lighter green frogs are easier to see by predators. Explain how natural selection could lead to a change in allele frequency. If, let's say, the lighter green frogs get eaten so much because the predator sees them, there will be not many green frogs, and at that point, not many lighter green recessive alleles. 2. Natural selection is an example of a mechanism of evolution. Does this mechanism produce a change in individuals or populations? Explain! The change produced by natural selection happens in populations because there are both, let’s say, light and dark green frogs in a population and the light ones get eaten. So the allele change happens in an entire population. 3. A major point of understanding natural selection is that not all organisms in a population get to reproduce. Consider the term fitness as used in biology. How does this term relate to natural selection? Natural selection, the ability to survive, affects the ability to reproduce, which is fitness. If you are dead, then you can’t reproduce. 4. Based on your answer above, do organisms with higher fitness mean that they have survived to an advanced age? Why or why not? It has nothing to do with how long the organisms survive. 5. Does fitness (as used in biology) and survival have the same meaning? Why or why not? No because 6. If an organism has high biological fitness in one environment, does that mean that it would also have high biological fitness in another environment? Why or why not? There might be selective pressure from the environment. 7. How could fitness relate to the changes in the forelimb structure of humans, dogs, birds and whales? They evolved because of selective pressure from their environment and this will help them live in their environment better. 8. Two students are discussing natural selection in bacteria and how it can relate to antibiotic resistance in bacteria. ● Bernadette states that when antibiotics are used, bacteria can respond by developing traits to help them defeat the antibiotic, which then may increase their fitness. ● Dominique states that there is already a variety of traits among the bacteria. Bacteria that have traits that allow them to survive the antibiotic and reproduce may have higher fitness. Which individual's reasoning do you agree with more and why? I agree with Dominique because traits are random and they don’t respond to anti bioticslike what Bernadette is saying