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- To map QTLs, strains are crossed that differ with regard toa. a quantitative trait.b. molecular markers.c. a quantitative trait and molecular markers.d. a quantitative trait and a discontinuous trait.Two traits with similar phenotypic variance exist in apopulation. One trait has two major genes and sixminor loci that influence the phenotypic value, andthe second trait has 12 minor loci and no major genesaffecting the phenotypic value. Does this informationtell you which trait you should expect to respondmost consistently to selection? Explain why it doesor does not.1- If additive genes contribute to all of the observed phenotypic variation for a quantitative characteristic, then what must be true? a-Narrow-sense heritability for this characteristic will be equal to 0.5 b-The mean phenotype of the parental generation will be equal to the phenotype of the individuals in F1 c-Broad-sense-heritability for this characteristic will be greater than narrow-sense heritability. 2- How can a geneticist find and map quantitative trait loci (QTLs)? a-By dividing the covariance by the product of the standard deviations of traits x and y b-By determining whether different genotypes for a known DNA marker also show variation in a quantitative characteristic c-By determining the selection response "R" and the selection differential "s" d-By calculating the genetic variance for a quantitative from the phenotypic and environmental variance asap please.
- The narrow-sense heritability for a trait is 0.4 and the selection differential is 0.5. What isthe predicted response to selection?What 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 patternsThe following table gives the percentage of twinpairs studied in which both twins expressed the same phenotypefor a trait (concordance). Percentages listed arefor concordance for each trait in monozygotic (MZ) anddizygotic (DZ) twins. Assuming that both twins in eachpair were raised together in the same environment, whatdo you conclude about the relative importance of geneticversus environmental factors for each trait?
- Saying that a quantitative trait follows a continuum means thata. the numerical value for the trait increases with the age ofthe individual.b. environmental effects are additive.c. the phenotypes for the trait are continuous and do not fallinto discrete categories.d. the trait continuously changes during the life of an individual.Is each of the following examples due to directional, disruptive, balancing, or stabilizing selection? A. Polymorphisms in snail color and banding pattern as described. B. Thick fur among mammals exposed to cold climates C. Birth weight in humans D. Sturdy stems and leaves among plants exposed to windy climatesHow is the response to selection related to narrow-sense heritability andthe selection differential? What information does the response toselection provide?
- Which of the following statements about quantitative genetics is TRUE? Heritability is the measure of the proportion of an individual's phenotype that is due to genetics. QTL mapping provides an overestimate of the number of genes contributing to a quantitative trait. A threshold trait is measured in whole numbers. An H2 value (broad-sense heritability) that approaches 0.0 means that almost all the phenotypic variation is determined by genetic differences. The h2 (narrow-sense heritability) value is a prediction of the impact that selection may have in altering an initial population by artificial selection.A danger in computing heritability values from studiesinvolving genetically related individuals is the possibility that theseindividuals share more similar environments than do unrelatedindividuals. In the experiment shown in Figure 24.8, which dataare the most compelling evidence that ridge count is not causedby genetically related individuals sharing common environments?ExplainIf the heritability of a trait is 0.7 and the selection differential is -10, what is the predicted response to selection?