Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 19, Problem 2AWK
Why is it that the range of resting blood pressures of humans is best represented by a bell-shaped curve covering a continuous range rather than by two populations, one with high blood pressure and one with normal blood pressure?
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The trait of blood pressure in humans has a frequency distributionthat is similar to a normal distribution. The following graph showsthe ranges of blood pressures for a selected population of people.The red line depicts the frequency distribution of the systolic pressuresfor the entire population. Several individuals with high bloodpressure were identified, and the blood pressures of their relativeswere determined. This frequency distribution is depicted with a blueline. (Note: The blue line does not include the people who wereidentified with high blood pressure; it includes only their relatives.)
What do these data suggest with regard to a genetic basis for highblood pressure? What statistical approach could you use to determinethe heritability for this trait?
Suppose that you just learned that the narrow-sense heritability of blood pressuremeasured among a group of African Americans in Detroit, Michigan, is 0.4. What doesthis heritability tell us about genetic and environmental contributions to blood pressure?
A hypothetical population of 10,000 humans has 6840 individuals with the blood type AA, 2860 individuals with blood type AB and 300 individuals with the blood type BB. If the next generation contained 25,000 individuals, how may individuals would have BB blood type, assuming the population is in Hardy-Weinberg equilibrium? Express as a whole number.
Chapter 19 Solutions
Human Biology: Concepts and Current Issues
Ch. 19 - If you might be a carrier of a gene for an...Ch. 19 - Prob. 2QCCh. 19 - Prob. 1CRCh. 19 - Prob. 2CRCh. 19 -
3. Distinguish between genotype and phenotype.
Ch. 19 - Describe the contributions of Mendel to the field...Ch. 19 - Explain how alterations of chromosome number and...Ch. 19 - Prob. 6CRCh. 19 - Prob. 7CRCh. 19 - Describe what is meant by sex-linked inheritance.
Ch. 19 -
9. Explain why lethal diseases caused by dominant...Ch. 19 - Prob. 10CRCh. 19 - All of the following statements about homologous...Ch. 19 - Prob. 2TYCh. 19 -
3. Which of the following statements correctly...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Which of the following results in the separation...Ch. 19 - Prob. 9TYCh. 19 - Prob. 10TYCh. 19 - What tool is used to determine the probabilities...Ch. 19 - Prob. 12TYCh. 19 - What is the basis for the tremendous genetic...Ch. 19 - Prob. 14TYCh. 19 -
15. Which of the following events or processes...Ch. 19 -
1. What fraction of the offspring of two...Ch. 19 -
2. Why is it that the range of resting blood...Ch. 19 - Prob. 3AWKCh. 19 - Geneticists often study patterns of gene transfer...Ch. 19 - Prob. 5AWKCh. 19 - Prob. 6AWKCh. 19 - Nondisjunction during meiosis can lead to the...
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- If the frequency of human birth weights were subject to evolution by natural selection, what phenotype(s) would selection be acting against given the observed pattern of neonatal mortality? What kind of selection is this?arrow_forwardIn a group of 200 humans, 160 have blood type MM, 36 have MN and 4 have NN. What is the frequency of the N allele? Of the M allele?arrow_forwardA hypothethical population of 10,000 humans has 6,840 individuals with the blood type AA, 2,860 individuals with blood type AB and 300 individuals with the blood type BB. What is the frequency of each genotype in this population? AA = AB = BB = What is the frequency of the A allele? What is the frequency of the B allele?arrow_forward
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- The following frequencies were gathered in an African population affected with sickle-cell anemia: SS, 75.5%; Ss, 23.0%; ss, 1.5% (S = normal hemoglobin allele; s = mutant hemoglobin allele). Calculate the genotypic frequencies and determine whether this data represent a population that is in HWE.arrow_forwardWhich of the following represent two regional populations exhibiting contrasting manifestations of adaptation to different environments according to the Allen's and Bergmann's rules? Group of answer choices Middle Eastern and Tibetan populations Alaskan and Sub-saharan populations Central American and West African populations Canadian and French populationsarrow_forwardBased on stochastic issues, allelic drop-out/drop-in and varying statistical models what statistic do you like the best and why? Make sure you compare and contrast the statistic of your choosing against the statistics you did not choose. Additionally, how has, if at all, the ABI capillary electrophoresis platforms increased the ability to utilize statistical models?arrow_forward
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