Which of the following are examples of genetic drift? (CHECK ALL THAT APPLY): A.
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Which of the following are examples of genetic drift? (CHECK ALL THAT APPLY): A. Two Aa organisms have two offspring: Both are AA (there is no selection pressure) B. An advantageous allele goes to fixation in a large population (over several generations) C. A duck floating in a pond drifts to the other side and finds a mate D. An infertile organism has zero offspring E. An advantageous allele goes to extinction in a small population (over several generations) Question 2 of 6 2.0 Points Which of the following statements are true regarding relative fitness? (CHECK ALL THAT APPLY) A. The least fit genotype is assigned a value of zero B. The most fit genotype is assigned a value of 1 Lc. selective pressure, if present, does not affect genotypes with relative fitness of 1 D. Relative fitness reflects the relative ability of organisms with that genotype to reproduce E.All organisms with a relative fitness of 1 will produce offspring ° F. In a constant environment, relative fitness will increase from generation to generation, approaching 1Explanation / Answer
Genetic drift is defined as changes in allele frequence due to chances. An allele is beneficial may be fixed in population or an allele harmful may be deleted from population. The allele fixation or extinction resulted with rapid period of time. Founder effect and bottle neck are two types of genetic drifts. Founder effect is a new population is formed in a new location. for example, a species of birds are separated from mainland and living new island produce offpsring with new alleles that enable them to survive in new environment. Bottleneck effect is decrease in population due to predators, disease, competition or natural disasters. Therefore, options C and D are correct.
2.
Relative fitness of an organism is defined as survival and reproduction of a genotype to maximum than the other genotypes within the population. The relative fitness is maximum when its value is 1. Most fit genotype exhibits value of relative fitness as 1. Thus, statements B, D, E and F are correct.
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