1. Which of the he following is the phenomenon by which all variation first arls
ID: 3165042 • Letter: 1
Question
1. Which of the he following is the phenomenon by which all variation first arlses winhin a) Mutation b) Adaptation e) Inherltance d) Geneke drift e) Natural selection an of the following are most Ikely to eventually become speciest o) A mixed population of blue-flowered amd white-flowered Anemone plants that some time of the year on of Anolis lizards where, because of overcrowding, some individuals have tropical and subtropical sone b). A populati a nearby uninhabired island. ang population of monkeyflowers (Mimulus spp.) that straddle the landmasses about the con be pollinated by the same bird species Populations of howler monkeys that Panama Canal. None of the above. inhabit the northern and southern d) e) 3. The effects of genetic drift can be directly counteracted by a) genetíc uniformity (low number of allele variants).. b) small population size. c) extinction. d) selection e) none of the above Questions 4-8: Matching. figure on the right who is associated with that concept. March the numbered concept on the right with the letter of the historical 4. Essentialism a) Lamarck b) Darwin c) Aristotle d) Malthus e) Lyell 5. "Essay on Population" 6. Uniformitarianism 7. Transformism 8. Adaptive rodiation 9. Which of the following statements best describes a feature of the lysogenic cycle of lambda (A) phage? a) After infection, the viral genes immediately turn the host cell into a phage-producing factory, and the host cell then lyses. b) Most of the prophage genes are activated by the product of a particular prophage gene. c) The phage genome replicates along with the host genome. d) Certain environmental triggers can cause the phage to exit the host genome, ?witching from the lyt to the lysogenic The phage DNA is incorporated by crossing over into any non specific site on the host cell's DNA.Explanation / Answer
1) Inheritance is the basis of heredity. It is a process by which one character is transfer from parental generation to progeny. But here we are talking about variation, which is the degree of differences between characters. So, we can ignore the option c. Genetic drift is a population level phenomenon by which allele frequencies of a population change over generations due to chance. Mutation is the permanent alteration of nucleotide sequence of a genome of an organism. It occurs at the individual level. It helps to create genetic changes in the organism which may responsible for some phenotypic changes. These may help a particular species for adaptation in an environment. Natural selection occurs when some variants in a population is more reproduce than other variants as a result of being better adapted to the environment. From, the above explanation it's clear that mutation is main responsible for the variation that occurs in a population. So, the correct answer is option a.
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