tion would lead to an m both snal within a population? A. directional selectiorn
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tion would lead to an m both snal within a population? A. directional selectiorn B. stabilizing selection C. disruptive selection 15. If the age of sexual maturation is wide-ranging, and is a highly heritable (non-plastic) trait, what relationship would you expect to find? A. Genotypes differ in the age at which they reproduce. B. Non-genotypic factors such as environmental variation are primarily responsible for the age at which individuals begin reproducing. C. Age of sexual maturation is the only trait that is heritable. D. A high variation in genotype corresponds with a low variation in phenotype 16. Allele frequencies of a population will change from one generation to the next A. under the conditions of negative selection. B. under the conditions of disruptive selection. C. under the conditions of stabilizing selection. D. all of the above E. A and B, but not C 17.The interactions across genes that bring about a phenotype is known as A phenotypic plasticity. 8. organism fitness C. the dominance of the alleles. D. epistasis 18. When flanking regions are the same around an allele, as found across multiple members of the population This suggests selective sweep of positive selection for that allele. B. There is no linkage. C. A D. Higher levels of recombination occur 19. Which A. The ong period of time has elapsed with neutral drift for the overall region in question. of the following is an instance of homology? Presence of a waxy capsule in mycobacteria and the presence of wax in a beehive B. Th e similar pattern of bone arrangement (L.e., humerus, ulna and radius) found in the wing of C. a bird and the forearm of a mammal The absorption of DNA? toan Escherichia coli cell from a bacterial lineage of a different species D. The red colora tion of a bacterial strain and the red coloration of feathers found on robins. 20. A drought has altered the prevalent form of nutrition available to a large population of bird s on an isolated island in the ocean. Assuming there is phenotypic variation for a bird trait related to nutrient consumption and that this trait is heritable, this situation would lead to A. a higher mutation rate B. natural selection C artificial selectionExplanation / Answer
14. C. Disruptive selection. Directional selection leads to either large or small sized adults. Stabilizing selection leads to medium sized adults.
15. A. Genotypes differ in the age at which they reproduce. Since it is non-plastic highly heritable, environmental effects will be least.
16. D. All of the above. These are the types of natural selection which select individuals in a population with better fitness, thus change the allelic frequency.
17. D. Epistasis. Interaction of genes decides the phenotype.
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