Which of the following statements is not true about heritability? a. H^2 is always a number between 0 and 1 b. H^2 =1 indicates most variation in a trait among individuals due to variation in genes c. H^2 means what fraction of variation in a trait is due to variation in genes and what fraction is due to variation in environmental conditions d. H^2 =1 indicates most variation in a trait among individuals due to variation in environments

Which of the following statements is not true about heritability? a. H^2 is always a number between 0 and 1 b. H^2 =1 indicates most variation in a trait among individuals due to variation in genes c. H^2 means what fraction of variation in a trait is due to variation in genes and what fraction is due to variation in environmental conditions d. H^2 =1 indicates most variation in a trait among individuals due to variation in environments

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 12QP

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Which of these definitions of heritability is most correct? a)The total amount of phenotypic variation in a population. b) The total amount of genetic variation in a population. c) The proportion of phenotypic variation in a population that is due to genetic factors. d) The proportion of phenotypic variation in a population that is due to environmental factors.
Heritability of a biological trait is best defined as which of the following? a. The proportion of variation in a trait that is specifically due to genes. b. The proportion of variation in a trait that is due to the environment and genes c. The proportion of variation in a trait that is only due to dominant additive genetic variance. d. The proportion of variation in a trait due to developmental effects.
Are the following statements regarding heritability true or false?A. Heritability applies to a specific population raised in aparticular environment.B. Heritability in the narrow sense takes into account all types ofgenetic variance. C. Heritability is a measure of the amount that genetics contributesto the outcome of a trait.
If a trait determined by autosomal recessive allele occurs at a frequency of 0.25 in a population, what are the allelic frequencies? Assume Hardy-Weinberg equilibrium and use A and a to symbolize the dominant and recessive alleles, respectively. Show calculation.
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?
Figure 19-11 shows the expected distributions for thethree genotypic classes if the B locus is a QTL affectingthe trait value.a. As drawn, what is the dominance/additive (D/A)ratio?b. How would you redraw this figure if the B locus hadno effect on the trait value?c. How would the positions along the x-axis of thecurves for the different genotypic classes of the B locuschange if D/A = 1.0?
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.
If a trait determined by an autosomal recessive allele occurs at a frequency of 0.25 in a population, what are the the allelic frequencies? Assume Hardy-Weinberg equilibrium and use A and a to symbolize the dominant and recessive alleles, respectively.
In your own words, explain the meaning of the term heritability.Why is a heritability value valid only for a particular population ofindividuals raised in a particular environment?
If all the genetic variance in a character is additive, what is the value of narrow sense heritability? Group of answer choices 1 0.5 0
Flower color in the varieties of pea plants studied by Mendel is controlled by alleles at a single locus. A group of peas homozygous for purple flowers is grown. Careful study of the plants reveals that all their flowers are purple, but there is some variation in the intensity of the purple color. What would the estimated heritability be for this variation in flower color? Explain your answer.
How do scientists evaluate distributions of phenotypes to estimate the heritability of a complex trait—that is, the contributions of genes (as opposed to the environment) to the phenotypic differences observed in a particular population?