Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus non-additive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute 2 units, and partially additive alleles contribute 1 unit to height. Can two individuals of moderate height produce offspring that are much taller or shorter than either parent? What is the percentage of offspring which manifest transgressive variation? Express answer in percentage form. Significant # of decimal places for answer: 2

Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus non-additive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute 2 units, and partially additive alleles contribute 1 unit to height. Can two individuals of moderate height produce offspring that are much taller or shorter than either parent? What is the percentage of offspring which manifest transgressive variation? Express answer in percentage form. Significant # of decimal places for answer: 2

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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Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus nonadditive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute two units, and partially additive alleles contribute one unit to height. (a) Can two individuals of moderate height produce offspring that are much taller or shorter than either parent? If so, how? (b) If an individual with the minimum height specified by these genes marries an individual of intermediate or moderate height, will any of their children be taller than the tall parent? Why or why not?
Assume that hair color, hair line, and skin tone in humans are different traits that are controlled by independently-assorting genes. Brown hair (B) is dominant to blond hair (b), a widow’s peak (W) is dominant to a straight hairline (w), and freckles (F) are dominant to no freckles (f). What is the likelihood that the child of a BBWwff person and a bbwwFF person will have: brown hair, a widow’s peak, and freckles? There is no missing information, just have to set up the punet square and I'm not sure how to do all traits.
Assume that human ear length is influenced by multiple genetic and environmental factors. Suppose you measure ear length in three groups of people, in which group A consists of five unrelated people, group B consists of five siblings, and group C consists of five first cousins. a. With the assumption that the environments of all three groups are similar, which group should have the highest phenotypic variance? Explain why. b. Is it realistic to assume that the environmental variance for each group is similar? Explain your answer.
. In pea plants, height is controlled by a Dominant Allele (T) for Tall Height and by a Recessive Allele (t) for Short Height. If 96% of a population of pea plants have the tall phenotype, calculate the frequencies of dominant allele (T) & recessive (t) alleles. Out of the 96%, what is the estimation of how many are homozygous dominant vs. heterozygous? What is the frequency of the recessive phenotype?
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Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic frequencies of the MN blood group locus (see Question 2 for a description of the MN blood group) in a small human population. You find that for 1-year-old children, the genotypic frequencies are MM = 0.25, MN = 0.5, and NN = 0.25, whereas the genotypic frequencies for adults are MM = 0.3, MN = 0.4, and NN = 0.3. a. Compute the M and N allele frequencies for 1-year-olds and adults. b. Are the allele frequencies in equilibrium in this population? c. Are the genotypic frequencies in equilibrium?
Assume for simplicity that height is a discrete characteristic that is affected most strongly by a single locus with two alleles, T and S. Homozygous TT are taller than average, heterozygous TS are of average height, and homozygous SS are shorter than average. a) In the Dutch population, the results of height on fertility in males is an example of heterozygote advantage, heterozygote disadvantage, general dominance, selection against a dominant phenotype, or selection against a recessive phenotype? b) Would your answer above change for the Dutch women? c) What about the American men and women? d) Can you provide an explanation for the discrepancies in this phenomenon between the Dutch and American populations?
In humans, hair color and structure are determined by two independent pairs of genes. The dominant gene T determines dark hair color, and the recessive allele t - light hair; The dominant gene S determines the formation of curly hair, and its recessive allele t - straight hair. What kind of hair will the children have if the mother has light, straight hair, and the father has dark, curly hair (one of the pairs of traits is heterozygous for both parents)?
Assume for simplicity that height is a discrete characteristic that is affected most strongly by a single locus with two alleles, T and S. Homozygous TT are taller than average, heterozygous TS are of average height, and homozygous SS are shorter than average. a) In the Dutch population, the results of height on fertility in males is an example of? b) Would your answer above change for the Dutch women? c) What about the American men and women? d) Can you provide an explanation for the discrepancies in this phenomenon between the Dutch and American populations?
In a species of dog, plaid color is represented by P and purple by p, short -tailed is T and long-tailed is t. What are the genotypes of a male who is purple with a long tail, and a female who is homozygous dominant for both traits? Which answer below is true? PpTT & PPTT pptt & PPTT short-tailed purple & long tailed plaid male: purple w/ long tail & female: plaid w/ short tail
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.