Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 5, Problem 26QP
Suppose that a team of researchers analyzes the heritability of high SAT scores and assigns a heritability of 0.75 for this ability. The team also determines that a certain ethnic group has a heritability value that is 0.12 lower compared with that of other ethnic groups. The group concludes that there must be a genetic explanation for the differences in scores. Why is this an invalid conclusion?
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Chapter 5 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
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- If no genetic variation was observed within a particular population for a given trait, what will be the computed broad sense heritability value for the trait in the population?arrow_forwardA characteristic has a narrow-sense heritability of 0.6. a. If the dominance variance (VD) increases and all other variance components remain the same, what will happen to narrow-sense heritability? Will it increase, decrease, or remain the same? Explain. b. What will happen to broad-sense heritability? Explain. c. If the environmental variance (VE) increases and all other variance components remain the same, what will happen to narrow-sense heritability? Explain.arrow_forwardChoose the correct answer regarding heritability estimates:Which is more useful for predicting how a population will respond to selection? Which is higher, broad- or narrow-sense heritability?1. broad-sense heritability (H2) 2. narrow-sense heritability (h2)arrow_forward
- What is a frequency distribution? Explain how such a graph is made for a quantitative trait that is continuous.arrow_forwardCystic fibrosis is an autosomal recessive disease. In a population of one hundred individuals, twenty-five are found to have the disease. Assuming Hardy-Weinberg equilibrium, what is the percent of the population that are carriers for cystic fibrosisarrow_forwardA characteristic has a narrow-sense heritability of 0.6.a. If the dominance variance (VD) increases and all other variancecomponents remain the same, what will happen to narrow-senseheritability? Will it increase, decrease, or remain the same? Explain.b. What will happen to broad-sense heritability? Explain.c. If the environmental variance (VE) increases and all other variancecomponents remain the same, what will happen to narrow-senseheritability? Explain.d. What will happen to broad-sense heritability? Explain.arrow_forward
- For each of the following relationships, correlation coefficients forheight were determined for 15 pairs of individuals:Father-daughter: 0.41Father-granddaughter: 0.18Sister-sister: 0.40Sister-sister (fraternal twins): 0.41Sister-sister (identical twins): 0.83What is the average heritability for height in this group?arrow_forwardYou perform the experiment you described in the last question. And find that the variance due to genetics is 99 feet. What is the heritability of trunk height?arrow_forwardCompute the broad sense and narrow sense heritability using the formulaarrow_forward
- What is the likely ancestry of this individual? (For the purposes of this exercise, you may limit your response to European, African, or Asian.) What indicators lead you to this conclusion? Were there any indicators that did not match with your determination? If so, does that invalidate your analysis? Why or why not?arrow_forwardAssume 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.arrow_forwardWhat is the likely ancestry of this individual? (For the purposes of this exercise, you may limit your response to European, African, or Asian.) What indicators lead you to this conclusion? Were there any indicators that did not match with your determination? If so, does that invalidate your analysis? Why or why not? Please be thorough with your answer and answer all parts of the questions.arrow_forward
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