The following questions are based on Reverend Darwin''s Detour readings. One/more options might be right. Choose all that apply 1. What all did Darwin conclude from his findings a. Evolution is a fact b. Organisms descended from a common ancestor c. Natural selection is a mechanism of evolution d. Recombination in meiosis is contributing to variations in offsprings e. Species are identical in all islands of Galapagos as in the mainland 2. According to Darwin evolution is a. Branching b. Ladder like c. Not real d. Through extinction of old species e. Not observed in fossils
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Step 1: Darwin concluded that organisms descended from a common ancestor and that natural selection is a mechanism of evolution. Show more…
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Which of the following observations led Charles Darwin to his theory of natural selection as the mechanism for evolution? Choose all that apply: Individuals in a population of any species vary in many heritable traits. A population of any species has the potential to produce far more offspring than will survive to produce offspring of their own. Individuals of a population are unequal in the likelihood of surviving and reproducing. Individuals with heritable traits best-suited to the local environment will generally produce a disproportionate number of healthy, fertile offspring.
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1. Darwin never said that evolution is about the "survival of the fittest". What did he say instead? 2. Explain the difference between microevolution and macroevolution. Which of the two would apply to the occurrence of antibiotic resistance in a bacterial population exposed to common antibiotics? 3. How does the bottleneck effect influence the genetic variability of a species? 4. Explain the meaning of a reproductive barrier. 5. What is a hybrid zone? 6. Natural selection is only one of many mechanisms that modern biologists consider as forces that shape evolution. Another one is called genetic drift. How would natural selection and genetic drift differ from each other? 7. Darwin proposed that species evolve in a gradual pattern through the accumulation of many small changes. However, another modern model is called punctuated equilibrium (pattern). What is the main difference between these two models?
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Darwin's theory of evolution by natural selection is based on four observations about the natural world. One of them is that each individual has a combination of traits that makes it uniquely different. Darwin recognized that much of this variation among individuals must be inherited, but he did not know about Mendel's mechanism of inheritance. Based on what you have learned in this chapter, briefly explain the variation among individuals that Darwin observed.
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