Additive Total Varian ce Total Genetic Varian ce Dominan ce Genetic Varian ce Trait Environmental Genetic Varlance Variance Fruit Size 100 70 40 30 30 Acidity Seed Count 100 70 50 30 100 85 40 45 15 Color 100 65 60 35 The table above lists total variance and components of total variance for four traits in tomatoes. Which trait would be expected to be most responsive to improvement by selective breeding? Fruit size Acidity Seed count Color

Additive Total Varian ce Total Genetic Varian ce Dominan ce Genetic Varian ce Trait Environmental Genetic Varlance Variance Fruit Size 100 70 40 30 30 Acidity Seed Count 100 70 50 30 100 85 40 45 15 Color 100 65 60 35 The table above lists total variance and components of total variance for four traits in tomatoes. Which trait would be expected to be most responsive to improvement by selective breeding? Fruit size Acidity Seed count Color

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter7: Development And Sex Determination

Section: Chapter Questions

Problem 14QP: Sex-Influenced and Sex-Limited Traits What method of sex testing did the International Olympic...

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The leaf width of a particular plant has an environmental variance of 2.3 cm, an epistatic variance of4.8 cm, a dominance variance of 1.6 cm, and an additive variance of 3.8 cm. Determine, and interpret,the broad sense and narrow sense heritability.
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Phenotypic variation in the tail length of mice has the following components: Additive genetic variance (VA) Dominance genetic variance (VD) Gene interaction variance (VI) Environmental variance (VE) Genetic–environmental interaction variance (VGE) a. What is the narrow-sense heritability of tail length? b. What is the broad-sense heritability of tail length?
Sex-Influenced and Sex-Limited Traits What method of sex testing did the International Olympic Committee previously use? What method did it use subsequently? Does either of these methods conclusively test for femaleness? Explain.
The mean, standard deviation, variances, and coefficient of variance of plant height from two rice plants (P1 and P2) and their progeny (F1 and F2) and a backcross generation (P1 x F1) are shown below. Explain the possible reasons for the observed differences in the sample means. Account for the differences in the sample means of P1 and P2. Similarly, account for the differences in the sample means of the F1 and F2. Compare the difference in the parental generations with that in the filial generations.
The mean and variance of Corolla length in two highly strains of tabacco and their progeny are shown in the following table one parent (P1) has a short corolla and the other parent ( P2) have a long corolla calculate the broad sense heritability (H) of Corolla length in the plant Strain. Mean(mm). Variance (mm) P1 short 40.47. 3.12 P2 long. 93.75. 3.87 F1(P1×P2). 63.90. 4.74 F2(F1×F2). 68.72. 47.70
QTL mapping and GWA (association) mapping are two different methods used to identify genes that affect complex traits. For each of the following statements, choosewhether it applies to QTL mapping, association mapping, or both.whether it applies to QTL mapping, association mapping, or both.
Compare the sample variances of P1 and P2. Account for any differences. Similarly, compare the sample variances of the F1 and F2 generations, and account for any differences. Give the possible causes of variation in each generation.
The heritability for egg weight in a group of chickens on a farm inMaine is 0.95. Are the following statements regarding this heritabilitytrue or false? If a statement is false, explain why.A. The environment in Maine has very little effect on the outcomeof this trait.B. Nearly all of the phenotypic variance for this trait in this groupof chickens is due to genetic variance.C. The trait is polygenic and likely to involve a large number ofgenes.D. Based on the observation of the heritability in the Mainechickens, it is reasonable to conclude that the heritability foregg weight in a group of chickens on a farm in Montana isalso very high.
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?
Consider the following scenario: A man without freckles (freckles are a dominant trait, determined by the dominant allele “F”) is a carrier of cystic fibrosis (recall that CF is a recessive trait, determined by the recessive allele "a"), mates with a woman whose genotype is heterozygous for freckles and is also a carrier of CF. Assume the two genes in question are in different chromosomes and, therefore, assort independently. Complete the following Punnett square to generate the offspring probabilities from this couple, by entering the genotypes of the parents, the gametes, and the offspring for the two traits described above. (4) Father’s genotype ffAa Mother’s genotypeFfAa ● Sperm: fA ● Sperm: fa ● Sperm: fA ● Sperm: fa ● Egg: FA ● Egg: fA ● Egg: Fa ● Egg: fa What is the probability for this couple to have a child with freckles? What is the…
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