Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 28.4, Problem 2COMQ
To map QTLs, strains are crossed that differ with regard to
a. a quantitative trait.
b. molecular markers.
c. a quantitative trait and molecular markers.
d. a quantitative trait and a discontinuous trait.
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Which of the following can the results of a QTL tell you?
a.
Identify all of the causative genes underlying a trait.
b.
Identify the specific marker locus causes the phenotype you are tracking.
c.
Identification of regions of the genome that are associated with a trait.
d.
Identify haplotypes associated with specific traits of interest in other populations.
A. How does the linkage of traits impact selection decisions in a breeding plan?
B. How are molecular markers useful for making selection decisions in the face of linkage drag?
Relatives are phenotypically similar in part because relatives are genetically similar. Which of the following also contribute to the phenotypic resemblance between relatives and can confound estimating trait heritability?
A.
Similar microbiomes
B.
Similar environmental factors
C.
Similar phenotypic responses to environmental factors
D.
Non-random association between genotypes and environmental factors
E.
All of the above
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Chapter 28 Solutions
Genetics: Analysis and Principles
Ch. 28.1 - 1. Which of the following is an example of a...Ch. 28.1 - 2. Saying that a quantitative trait follows a...Ch. 28.2 - The variance is a. a measure of the variation...Ch. 28.2 - 2. Which of the following statistics is used to...Ch. 28.3 - 1. For many quantitative traits, genotypes and...Ch. 28.4 - A QTL is a __________ where one or more genes...Ch. 28.4 - 2. To map QTLs, strains are crossed that differ...Ch. 28.5 - 1. In a population of squirrels in North Carolina,...Ch. 28.5 - Prob. 2COMQCh. 28.5 - 3. One way to estimate narrow-sense heritability...
Ch. 28.6 - 1. For selective breeding to be successful, the...Ch. 28.6 - Prob. 2COMQCh. 28 - Give several examples of quantitative traits.How...Ch. 28 - 2. At the molecular level, explain why...Ch. 28 - 3. What is a normal distribution? Discuss this...Ch. 28 - 4. Explain the difference between a continuous...Ch. 28 - What is a frequency distribution? Explain how such...Ch. 28 - 6. The variance for weight in a particular herd of...Ch. 28 - Two different varieties of potato plants produce...Ch. 28 - 8. If , would you conclude that a positive...Ch. 28 - Prob. 9CONQCh. 28 - When a correlation coefficient is statistically...Ch. 28 - 11. What is polygenic inheritance? Discuss the...Ch. 28 - What is a quantitative trait locus (QTL)? Does a...Ch. 28 - 13. Let’s suppose that weight in a species of...Ch. 28 - Prob. 14CONQCh. 28 - 15. From an agricultural point of view, discuss...Ch. 28 - Many beautiful varieties of roses have been...Ch. 28 - 17. In your own words, explain the meaning of the...Ch. 28 - 18. What is the difference between broad-sense...Ch. 28 - The heritability for egg weight in a group of...Ch. 28 - In a fairly large population of people living in a...Ch. 28 - When artificial selection is practiced over many...Ch. 28 - 22. Discuss whether a natural population of wolves...Ch. 28 - 23. With regard to heterosis, is each of...Ch. 28 - Here are data for height and weight among 10 male...Ch. 28 - 2. The abdomen length (in millimeters) was...Ch. 28 - 3. You conduct an RFLP analysis of head weight in...Ch. 28 - 5. Let’s suppose that two strains of pigs differ...Ch. 28 - Prob. 6EQCh. 28 - In a wild strain of tomato plants, the phenotypic...Ch. 28 - The average thorax length in aDrosophilapopulation...Ch. 28 - 9. In a strain of mice, the average 6-week body...Ch. 28 - Prob. 10EQCh. 28 - 11. A danger in computing heritability values from...Ch. 28 - For each of the following relationships,...Ch. 28 - An animal breeder had a herd of sheep with a mean...Ch. 28 - The trait of blood pressure in humans has a...Ch. 28 - Discuss why heritability is an important...Ch. 28 - From a biological viewpoint, speculate as to why...Ch. 28 - 3. What is heterosis? Discuss whether it is caused...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What is a quantitative trait locus (QTL)? Does a QTL contain onegene or multiple genes? What technique is commonly used to identify QTLs?arrow_forwardExamples of codominance include ABO blood type and coat color in cattle. In short horn cattle coat color pattern is determined by two alleles (CR = red; CW = white) that are both equally expressed. CRCW cattle are roan (red and white patches); therefore, both alleles affect the phenotype equally. The ABO system of blood typing exhibits codominance in humans. There are 3 alleles for the gene that determine ABO blood type (IA and IB are codominant alleles; allelei is recessive to alleles IA and IB). IAIA and I^i are type A; I®I® and IPi are type B; I^IB is type AB; ii is type O Practice Problem 4: 4a. If a man with blood type O marries a woman that is blood type AB, what are the predicted genotypes and phenotypes of their children? 4b. If a man with blood type A (I^i) marries a woman with blood type AB, what are the predicted genotypes and phenotypes of their children?arrow_forwardWhat is a quantitative trait locus (QTL)? a. A portion of the genome that is a particular quantitative length b. A portion of the genome in which polymorphic markers correlate with a phenotype c. A region of the genome where qualitative traits associate with discrete phenotypes d. A region of the genome that does not follow Mendelian inheritance patternsarrow_forward
- Show the generalized steps in breeding a recessive trait by the backcross method where rr is resistant (donor parent) and RR is susceptible (recurrent parent)arrow_forwardPlease help with the following: How does penetrance differ from expressivity in genetics? A. Penetrance is the percentage of individuals with a specific genotype that exhibit the expected phenotype while expressivity is the degree to which a phenotypic character is expressed. B. Penetrance is the degree of lethality of a specific genotype while expressivity is how frequently that genotype is seen in the population. C. Penetrance is the presence of more than two alleles at a locus within a group of individuals while expressivity is the influence of sex on which alleles express themselves. D. None of the above. E. Penetrance refers to the paternal effects of a gene while expressivity refers to the maternal effects of a gene.arrow_forwardWhich of the following statements about mendelian or complex diseases true?. A Genome- wide association studies rely on polymorphic markers that are linkage disequalibrium with alleles that contribute to the traits of interest. B. Genetic methods for studying Mendelian phenotype such as crossing is not useful for mapping quantitive trait loci. C. Mapping of quantitative trait loci does relies on genetic variations that directly contribute to the trait of interest.arrow_forward
- What is the Strategy for genetic mapping of quantitative trait loci (QTLs) influencing complex traits?arrow_forwardWhich of the following statements best describe the equation P = G + E + (G X E)?* a. The phenotype is the sum of the genotype and the environment. b. The phenotype of an organism is determined by its genetic traits. c. The phenotype is the total characteristics displayed by an organism that results from the expression of the genes as well as the influence of environmental factors. d. The phenotype is the observable and measurable characteristics of an organism as a result of the interaction of the genes of the organism, environmental factors, and random variation.arrow_forwardSearch the menus (Alt+/) 150% Normal text Calibri I U A 12 + 1 4 8 6. Use the images from the chart on the following page to write genotype (or genotypes) for each trait. a. Curly Tail e. Single Comb b. Long Hair f. Wooly Sheep 1 of 3 c. Agouti g. Drooping Ears d. Horned h. Erect Ears 7. Determine the genotypes for each using the chart on the next page. a. Heterozygous Spike Tail e. Homozygous Rose Comb b. Purebred Long Hair f. Hybrid Hairy Sheep c. Homozygous Agouti g. Purebred Erect Ears d. Hybrid Polled h. Homozygous Erect Earsarrow_forward
- Match the statement with the method for finding QTLs. Crosses are made between two strains that have different alleles for multiple markers Scans the whole genome in search for associations between markers and specific phenotypes tests two alleles that differ between the twoparents of the mapping population may sample a large number of individuals for the trait A. Both B. GWAs C. QTL mappingarrow_forwardBriefly describe the polygenic threshold theory. How polygenic traits can be genetically determined? What are major factors affecting gene frequencies? How the Hardy-Weinberg relationship can be used in genetic counseling? Is it useful for genetic risk prediction?arrow_forwardRegarding the analysis of single marker STR results used in forensic science. Tick all the correct statements: if a suspect's alleles are identical to those collected at a crime scene, then the suspect is possibly guilty dizygotic twins can have similar alleles at an STR locus no correct statement if a suspect's alleles are different from those found at a crime scene, then the suspect is definitely innocent monozygotic twins may have different alleles at an STR locus ☐if a suspect's alleles are different from those collected at a crime scene, then the suspect is possibly innocent ☐two unrelated individuals could have a similar genetic profile monozygotic twins cannot have different alleles at an STR locus dizygotic twins cannot have similar alleles at an STR locus ☐if a suspect's alleles are identical to those collected at a crime scene, then the suspect is definitely guiltyarrow_forward
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