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15. Which of the following is an example of genetic drift?a. allele g for fat production increases in a small population because birds with more body fat have higher survivorship in a harsh winter.b. random mutation increases the frequency of allele A in one population but not in another.c. allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. allele m is lost when a virus kills all but a few individuals and just by chance, none of the survivors possess allele m.
16. _____________ occurs when a population is established by a small number of individuals and ____________ develops when a population undergoes a drastic reduction in size.17. The end result of both Genetic bottleneck and founder effect is ________19. If Fitness relation is W11< W12< W22where W11, W12, and W22represent the fitnesses of genotypes A1A1, A1A2, and A2A2, respectively. Then following which one is correct-a. A1increases, A2decreases b. A2increases, A1decreases20. The average numbers of offspring produced by three genotypes are GG = 6; Gg = 3, gg = 2. What is the fitness of Gg? 21. The average numbers of offspring produced by three genotypes are GG = 6; Gg = 3, gg = 2. What is the selection coefficient (s) of Gg? 22. Overdominance leads to ____________ equilibrium with maintenance of both alleles in the population. Underdominance produces ______________ equilibrium because the heterozygote has lower fitness than either homozygote.23. Genetic drift ___________ divergence between populations because changes in allelic frequencies due to drift are random and are likely to occur in different directions in separate populations.a. Increases b. Decreases24. Natural selection can ________________ variation within populations, and it can increase or decrease divergence between populations.25. When gametes of two species may fuse and form a zygote, but there is no gene flow between the two species, either because the resulting hybrids are inviable or sterile or because reproduction breaks down in subsequent generations. This mechanism or process known as