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)
2nd Edition
ISBN: 9780134433769
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Chapter 19.2, Problem 3CC
MAKE CONNECTIONS Review the relationship between genotype and
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Recall that the Hardy-Weinberg model makes the following assumptions:
No mutations
Extremely large population
No gene flow
No selection
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.
To 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.
Chapter 19 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)
Ch. 19.1 - How did Huttons and Lyells ideas influence Darwins...Ch. 19.1 - MAKE CONNECTIONS Scientific hypotheses must be...Ch. 19.2 - How does the concept of descent with modification...Ch. 19.2 - Prob. 2CCCh. 19.2 - MAKE CONNECTIONS Review the relationship between...Ch. 19.3 - Explain how the following statement is inaccurate:...Ch. 19.3 - How does evolution account for (a) the similar...Ch. 19.3 - WHAT IF? Fossils show that dinosaurs originated...Ch. 19 - Which of the following is not an observation or...Ch. 19 - Which of the following observations helped Darwin...
Ch. 19 - Prob. 3TYUCh. 19 - The upper forelimbs of humans and bats have fairly...Ch. 19 - DNA sequences In many human genes are very similar...Ch. 19 - SCIENTIFIC INQUIRY DRAW IT Mosquitoes resistant to...Ch. 19 - FOCUS ON EVOLUTION Explain why anatomical and...Ch. 19 - FOCUS ON INTERACTIONS Write a short essay (about...Ch. 19 - SYNTHESIZE YOUR KNOWLEDGE This honeypot ant (genus...
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- Why is mutation important to evolution if it is the microevolutionary force that generally has the smallest effect on allele frequencies?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. 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 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_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. 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_forwardExplain how natural selection might be responsible for the PTC taster polymorphism.Why might some populations have a higher frequency of the taster allele than others?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_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_forwardSolve for the genetic structure of a population with 12 homozygous recessive individuals (yy), 8 homozygous dominant individuals (YY), and 4 heterozygous individuals (Yy).arrow_forward
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