Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
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.
Chapter 19 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd 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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- 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.arrow_forwardWhy 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_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. 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_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_forward
- please help with a, b, c, and d all of them asap!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_forwardsolve this please, the 1st problem. with explanationarrow_forward
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