Concept explainers
WHAT IF? Suppose two plant populations exchange pollen and seeds. In one population, individuals of genotype AA are most common (9,000 AA, 900 A8. 100 88), while the opposite is true in the other population (100 AA, 900 Aa, 9,000 aa). If neither allele has a selective advantage, what will happen over time to the allele and genotype frequencies of these populations?
Want to see the full answer?
Check out a sample textbook solutionChapter 21 Solutions
Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
Additional Science Textbook Solutions
Campbell Essential Biology (6th Edition) - standalone book
Concepts of Genetics (12th Edition)
Essentials of Genetics (9th Edition) - Standalone book
Human Anatomy & Physiology (2nd Edition)
Human Biology: Concepts and Current Issues (8th Edition)
Biological Science (6th Edition)
- 1. You measure the effects of a single allele (A2) on fitness in two populations of the same plant species, Population X and Population Y. Population X lives at higher altitudes. The average excess of fitness of the A2 allele (aA2) in Population X is 1.21, and the average fitness of the population (w) is 1.0. Population Y lives at a lower altitude. The average excess of fitness of the A2 allele (aA2) in Population Y is -1.68 and the average fitness of the population (w) is 1.0 a) Which population is likely to experience faster evolution? Why? b) What do you predict will happen to the frequency of the A2 allele (pA2) in population X? c) What do you predict will happen to the frequency of the A2 allele (pA2) in population Y? d) Why do you think the average excess of fitness of the A2 allele is different in these two populations?arrow_forward10 Low altitude population When the researchers 5 grew cuttings from the same plants in a garden at high altitude, the high altitude plants made 5 15 25 35 45 55 65 75 10 - more stems (19.89 ± 2.26 versus 28.32 +2.54). High altitude population 5 15 25 35 45 55 65 75 Number of stems archers took seeds from the same plant (a pure lineage) and raised environments. The graphs above show how plants responded to different altitudes. Based on these graphs, we can conclude: 90. Res em in different a. The number of stems is not influenced by the environment b. The number of stems is a heritable trait c. The number of stems is lower in high altitudes d. The number of stems is higher in low altitudes c. The number of stems is influcnccd by the cnvironment Number of plantsarrow_forwardwhich of the multiple choice?arrow_forward
- > Within a certain population, there are exactly 2 alleles at the T locus: T and t. Among the entire population, 30% of the alleles are T. If this population is in Hardy Weinberg equilibrium, what proportions (or percentages, however, you want to express it) will be TT, Tt, and tt? Show work. In a population, there are 75 TT individuals, 25 Tt individuals, and 250 tt individuals. What are the frequencies of T and t? Show work. What are the "expected" numbers of each genotype? Show work. Ís this population in Hardy Weinberg equilibrium? (don't do Chi², just compare your answer in a) b) c) part b io actual and it should be obvious.) ) Assume that, in a population of deer, two alleles exist for eye color. BB deer have blue eyes, Bb deer have purple eyes, and bb deer have red eyes. Out of a population of 1000 deer, 490 have blue eyes. You took notes on the amount of red and purple eyed deer, but your notebook fell in the mud and those numbers are obscured. However, if the population is in…arrow_forwardImagine a population in which the survival of A1A1 homozygotes is 80 percent as great as that of A1A2 heterozygotes, while the survival of A2A2 homozygotes is 95 percent that of the heterozygotes. What is p, the frequency of the A2 allele, at equilibrium? Now suppose the population has reached this equilibrium, but that the environment then changes so that the relative fitnesses of A1A1, A1A2, and A2A2 become 1.0, 0.95, and 0.90. What will p be in the adults after one generation of selection in the new environment?arrow_forwardNo Service x Survival: A recent field experiment examined how the genotype at one locus affected the fitness of trident maples. 200 individuals with genotypes AA, Aa and aa were planted Survival and average number of seeds per plant was surveyed as the following: Avg. seeds: OO aa O Aa Which genotype is the most fit? O AA O a AA Aa aa 12:44 AM 170 150 100 5 6 ✪ 53% 10arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning