The following table gives the percentage of twin pairs studied in which both twins expressed the same phenotype for a trait (concordance). Percentages listed are for concordance for each trait in monozygotic (MZ) and dizygotic (DZ) twins. Assuming that both twins in each pair were raised together in the same environment, what do you conclude about the relative importance of genetic versus environmental factors for each trait? Trait MZ % DZ % Blood types 100 66 Eye color 99 28 Mental retardation 97 37 Measles 95 87 Hair color 89 22 Handedness 79 77 Idiopathic epilepsy 72 15 Schizophrenia 69 10 Diabetes 65 18 Identical allergy 59 5 Cleft lip 42 5 Club foot 32 3 Mammary cancer 6 3

The following table gives the percentage of twin pairs studied in which both twins expressed the same phenotype for a trait (concordance). Percentages listed are for concordance for each trait in monozygotic (MZ) and dizygotic (DZ) twins. Assuming that both twins in each pair were raised together in the same environment, what do you conclude about the relative importance of genetic versus environmental factors for each trait? Trait MZ % DZ % Blood types 100 66 Eye color 99 28 Mental retardation 97 37 Measles 95 87 Hair color 89 22 Handedness 79 77 Idiopathic epilepsy 72 15 Schizophrenia 69 10 Diabetes 65 18 Identical allergy 59 5 Cleft lip 42 5 Club foot 32 3 Mammary cancer 6 3

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Description: The following table gives the percentage of twin pairs studied in which both twins expressed the same phenotype for a trait (concordance). Percentages listed are for concordance for each trait in monozygotic (MZ) and dizygotic (DZ) twins. Assuming th

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 9QP: Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic...

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The following table gives the percentage of twin pairs studied in which both twins expressed the same phenotype for a trait (concordance). Percentages listed are for concordance for each trait in monozygotic (MZ) and dizygotic (DZ) twins. Assuming that both twins in each pair were raised together in the same environment, what do you conclude about the relative importance of genetic (H) versus environmental (E) factors for each trait? Trait MZ % DZ % Blood types 100 66Eye color 99 28 Measles 95 87 Diabetes 65 18Mental retardation 97 37
The following table gives the percentage of twin pairs studied in which bothtwins expressed the same phenotype for a trait (concordance). Percentages listedare for concordance for each trait in monozygotic (MZ) and dizygotic (DZ) twins.Assuming that both twins in each pair were raised together in the sameenvironment, what do you conclude about the relative importance of genetic (H)versus environmental (E) factors for each trait?Traits MZ, % DZ, % H EBlood types 100 66Eye color 99 28Measles 95 87Diabetes 65 18Mental retardation 97 37
The 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?
Suppose that a geneticist studies a series of characteristics in monozygotic twins and dizygotic twins. He finds various rates of phenotypic concordance for the characteristics, as shown in the table. Rate of phenotypic concordance (%) Characteristic Monozygotic Dizygotic migraine headache 60 30 eye color 100 40 measles 90 90 clubfoot 30 10 high blood pressure 70 40 handedness 70 70 tuberculosis Classify each characteristic according to whether the corresponding rates of concordance indicate a genetic influence, an environmental influence, or both genetic and environmental influences.
In the following table, average differences of height, weight,and fingerprint ridge count between monozygotic twins (rearedtogether and apart), dizygotic twins, and nontwin siblings arecompared: Based on the data in this table, which of these quantitative traitshas the highest heritability values?
A geneticist studies a series of characteristics in pairs of monozygotic and dizygotic twins, obtaining the concordances listed below. For each characteristic, indicate whether these concordances suggest genetic influences, environmental influences, or both. Explain your reasoning. Concordance (%) Dizygotic Characteristic Monozygotic Migraine headaches 60 30 Eye color 100 40 Measles 90 90 Club foot 30 10 High blood pressure 70 40 Handedness 70 70 Tuberculosis
Assume that the concordance value for a particular trait is 85% for both monozygotic and dizygotic twins. What can be concluded about this trait? ○ It is caused by environmental factors in dizygotic twins but by genetic factors in monozygotic twins. It is likely caused almost exclusively by genetic factors. It is caused by both genetic factors and environmental factors. It is likely caused almost exclusively by environmental factors. It is caused by genetic factors in dizygotic twins but by environmental factors in monozygotic twins. Incorrect
A geneticist studies a series of characteristics in pairs of monozygotic and dizygotic twins, obtaining the concordances listed below. For each characteristic, indicate whether these concordances suggest genetic influences, environmental influences, or both. Explain your reasoning. Concordance (%) Characteristic Monozygotic Dizygotic Migraine headaches 60 30 Eye color 100 40 Measles 90 90 Club foot 30 10 High blood pressure 70 40 Handedness 70 70 Tuberculosis 5 5
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.
This lab exercise requires that we count certain Mendelian traits among students present in the lab. Your professor will explain each trait being addressed and will then ask students to identify if they are dominant or recessive for that specific trait. The collected traits will then be plugged into the Hardy-Weinberg Equilibrium formula in order to calculate frequency of Homozygous dominant, Heterozygous and Homozygous recessive individuals in the same. p2 + 2pq + q2 = 100 given data: trait: hair swirl 19 individuals total. 10 had the homozygous dominant hair swirl trait: clockwise the nine other were recessive please do a step by step explanation with the calculation using this data, as I am very unfamiliar with what values mean what and the equation itself thank you!
Which of the following statements about complex traits is/are TRUE? Twin studies help to tease apart the contribution of genetic and environmental factors to phenotypic variations. When describing quantitative traits, a high variance indicates that most individual values are not very close to the mean. Genetic factors determine Mendelian traits, while environmental factors determine complex traits. Both additive and dominant effect falls in the category of narrow sense heritability and can be directly passed on from parents to offspring.
Please explain how the more genes that contribute to a particular trait, the less discrete the categories become, and the more continuous it is, the distribution appears in a quantitative trait. Be sure that you include the following topics in your description: phenotypic categories, genotype, dominant and recessive, segregations of alleles, additive alleles.