Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 21.3, Problem 3CC
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?
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Chapter 21 Solutions
Campbell Biology in Focus
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- Need help with the question below ?arrow_forward1. 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_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_forwardPlease asaparrow_forward
- 下午7:08 1月27日周四 98% Yuki 1.23 AP环科课后作业和课堂笔记.pdf •.. 34. Which of the following statements about genetic diversity is true? (A) Genetic uniformity of a crop increases the crop’s overall resistance to pests and disease. (B) Genetic resistance to pests and diseases can be increased by crossing a crop plant with ancestral varieties. (C) Genetic engineering technology is used to increase genetic diversity by creating new species with synthetic genes. (D) Genetic diversity within populations of common crop species such as corn is typically high. (E) Genetic diversity is usually high in endangered species.arrow_forwardA population of wild flowers was scored for flower color. There were 493 blue (BB) plants, 1633 violet (BR) plants, and 859 red (RR) plants. Remember to keep 4 decimal digits on all frequencies. • What is the frequency of the blue (B) allele? • What is the frequency of the red (R) allele? What is the expected number of blue (BB) plants? • What is the expected number of violet (BR) plants? • What is the expected number of red(RR) plants? Keeping all decimal digits during your calculations and rounding your answer to 3 decimal digits, what is the calculated chi-square value? What is the number for the degrees of freedom? What is the critical value? Round to two decimal places. What is your conclusion from the chi-square test?arrow_forwardAmong a particular population of 100 plants, red flowers are dominant and yellow flowers are recessive. F is the dominant allele and f is the recessive allele. 40 plants are homozygous dominant • 44 plants are heterozygous 16 plants are homozygous recessive Use the Hardy-Weinberg equation to calculate the equilibrium frequencies of each genotypearrow_forward
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