Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Chapter 22.2, Problem 3CC
MAKE CONNECTIONS Ø Review the relationship between genotype and
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You score flower colour in a very large natural population where flower colour is a co-dominant trait where white and red are homozygotes (CWCW and CRCR) and pink are heterozygotes (CWCR). Taking your observed phenotypes and genotypes, you apply the Hardy-Weinberg principle and find an excess of homozygous individuals (that is, individuals with either white or red flowers).
Give two plausible explanations for this excess of homozygotes in the natural population.
Chapter 22 Solutions
Campbell Biology: Custom Edition
Ch. 22.1 - How did Hutton's and Lyell's ideas influence...Ch. 22.1 - MAKE CONNECTIONS Scientific hypotheses must be...Ch. 22.2 - How does the concept of descent with modification...Ch. 22.2 - WHAT IF? If you discovered a fossil of an extinct...Ch. 22.2 - MAKE CONNECTIONS Review the relationship between...Ch. 22.3 - Explain how the following Statement is inaccurate:...Ch. 22.3 - How does evolution account for (a) the similar...Ch. 22.3 - Prob. 3CCCh. 22 - Why was the age of Barth important for Darwin's...Ch. 22 - Describe how overreproduction and heritable...
Ch. 22 - Summarize the different lines of evidence...Ch. 22 - Level 1: Knowledge/Comprehension 1. Which of the...Ch. 22 - Which of the following observations helped Darwin...Ch. 22 - Prob. 3TYUCh. 22 - Prob. 4TYUCh. 22 - DNA sequences in manv human genes are very similar...Ch. 22 - EVOLUTION CONNECTION Explain why anatomical and...Ch. 22 - SCIENTIFIC INQUIRY DRAW IT Mosquitoes resistant...Ch. 22 - WRITE ABOUT A THEME: INTERACTIONS Write a Short...Ch. 22 - SYNTHESIZE YOUR KNOWLEDGE This honeypot ant (genus...
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- INTERPRET DATA In a population at genetic equilibrium, the frequency of the homozygous recessive genotype (tt) is 0.16. What are the allele frequencies of T and t, and what are the expected frequencies of the TT and Tt genotypes?arrow_forwardFor these experiment assume allele A = red, allele a = white . There are three flower colors (phenotypes and genotypes) for this species where AA=red, Aa = pink, aa = white. • A population of Four O-Clocks is in Hardy-Weinberg equilibrium and no evolutionary forces are acting on the population. Bees are introduced into the population. Individual bees only visit a single color of flower so that red flowers only mate with red flowers, pink with pink, and white with white. Assume you start out with a population where the frequency of the A allele is 0.2 and the population is initially in Hardy Weinberg equilibrium. What would the frequency of the Aa genotype be in the the next generation where positive assortative mating is 100% (i.e. there is no random mating)?arrow_forwardFor these experiment assume allele A = red, allele a = white . There are three flower colors (phenotypes and genotypes) for this species where AA=red, Aa = pink, aa = white. • A population of Four O-Clocks is in Hardy-Weinberg equilibrium and no evolutionary forces are acting on the population. Bees are introduced into the population. Individual bees only visit a single color of flower so that red flowers only mate with red flowers, pink with pink, and white with white. The simulator we have been using doesn't have "positive assortative mating" as an option, but if it did (in addition to the other parameters) which parameters should be changed to model this problem? Select all that need to be changed. O Selection O Migration O Mutation O Finite Population (i.e. population size) O Assortative Matingarrow_forward
- For these experiment assume allele A = red, allele a = white . There are three flower colors (phenotypes and genotypes) for this species where AA=red, Aa = pink, aa = white. • A population of Four O-Clocks is in Hardy-Weinberg equilibrium and no evolutionary forces are acting on the population. Bees are introduced into the population. Individual bees only visit a single color of flower so that red flowers only mate with red flowers, pink with pink, and white with white. What will happen to the allele frequency in the next generation? O The frequency of the a allele will increase O The frequency of the A allele will increase O The allele frequencies will stay the same.arrow_forwardFor these experiments assume allele A = red, allele a = white . There are three flower colors (phenotypes and genotypes) for this species where AA=red, Aa = pink, aa = white. • A population of Four O-Clocks is in Hardy-Weinberg equilibrium and no evolutionary forces are acting on the population. Bees are introduced into the population. Individual bees only visit a single color of flower so that red flowers only mate with red flowers, pink with pink, and white with white. What will happen to the genotype frequencies in the next generation? O The proportion of reds and whites will increase over pinks. O The population will remain in Hardy-Weinberg equilibrium. O The proportion of pinks will increase over reds and whites. The proportion of reds will increase over pinks and whites.arrow_forward. In pea plants, height is controlled by a Dominant Allele (T) for Tall Height and by a Recessive Allele (t) for Short Height. If 96% of a population of pea plants have the tall phenotype, calculate the frequencies of dominant allele (T) & recessive (t) alleles. Out of the 96%, what is the estimation of how many are homozygous dominant vs. heterozygous? What is the frequency of the recessive phenotype?arrow_forward
- Among 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_forwardTo analyze: Imagine the length of the maize ears which has narrow sense heritability (h²) of 0.70 A population yields ears that have an average length of 28 cm, and a breeder selects a plant harvesting 0.70 cm ears from this population and cross by self-fertilization. Find the expected selection differential (S) and the response to selection (R) for this cross.arrow_forwardPlease answer fast Which of the following are true about the logic we use to identify alleles under positive selection at a given locus? Question 3 options: Alleles under positive selection should occur at relatively high frequency. An allele that occurs at relatively high frequency because of genetic drift is likely to be a "young allele," which means it arose by mutation relatively recently. An allele that occurs at relatively high frequency because of positive selection is likely to be an "old allele," which means it arose by mutation relatively recently. "Old alleles" are likely to be in linkage disequilibrium with nearby loci. "Young alleles" are likely to be in linkage equilibrium with nearby loci. Consider what we now know about the tree of life. Which of the following statements are true? Question 8 options: Archaea is paraphyletic. Archaea and bacteria together form a monophyletic clade. There are three monophyletic domains of life: eukaryotes, archaea, and…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_forwardGraph 2: Draw the predictions of a population genetics model when the starting allele frequency of the A1 allele is 0.2, individuals that are homozygous for the A1 allele have a 5% increase in fitness, and otherwise all assumptions of the Hardy Weinberg model are true. 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0arrow_forwardPlease answer fast Consider a laboratory population that consists entirely of individuals with the same“repulsion” double heterozygous (diploid) genotype, Ab/aB. Assume the rate ofrecombination between the “A” and “B” loci is c = 1/ 4 .a) What are r, s, t and u in this population? What is D?b) What are r, s, t and u after 1 generation of random breeding? What is D?c) What are r, s, t and u after 5 generations of random breeding? What is D?arrow_forward
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