Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 21, Problem 6TYK
Which of the following represents an example of qualitative
a. the lengths of people’s toes
b. the body sizes of pigeons
c. human ABO blood types
d. the birth weights of humans
e. the number of leaves on oak trees
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If a dominant trait shows a penetrance of 50%, then ___.
A. All affected individuals in the population are heterozygotes.
B. Individuals who have the gene show an intermediate trait.
C. Half the individuals in the population have the gene.
D. Half the individuals in the population who have the gene show the trait.
In the universal ABO blood grouping system, there are four phenotypes—A, B, AB, and O—which are determined by three different alleles. The presence of three alleles in the ABO blood grouping system is an example of ____.
a.
a polymorphism
b.
the bottleneck effect
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d.
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e.
the founder effect
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.
Chapter 21 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 21.1 - If a population of skunks includes some...Ch. 21.1 - Prob. 2SBCh. 21.1 - What factors contribute to phenotypic variation in...Ch. 21.2 - Prob. 1SBCh. 21.2 - Why is the Hardy-Weinberg principle considered a...Ch. 21.2 - Prob. 3SBCh. 21.3 - Which agents of microevolution tend to increase...Ch. 21.3 - Which mode of natural selection increases the...Ch. 21.3 - In what way is sexual selection like directional...Ch. 21.4 - How does the diploid condition protect harmful...
Ch. 21.4 - Prob. 2SBCh. 21.4 - Prob. 3SBCh. 21.5 - How can a biologist test whether a trait is...Ch. 21.5 - Why are most organisms adapted to the environments...Ch. 21 - The reason spontaneous mutations do not have an...Ch. 21 - The phenomenon in which chance events cause...Ch. 21 - Prob. 3TYKCh. 21 - Prob. 4TYKCh. 21 - Prob. 5TYKCh. 21 - Which of the following represents an example of...Ch. 21 - A population of mice is at HardyWeinberg...Ch. 21 - If the genotype frequencies in a population are...Ch. 21 - An Eastern European immigrant carrying the allele...Ch. 21 - If a storm kills many small sparrows in a...Ch. 21 - Prob. 11TYKCh. 21 - Discuss Concepts Many human diseases are caused by...Ch. 21 - Prob. 13TYKCh. 21 - Apply Evolutionary Thinking Captive breeding...Ch. 21 - Prob. 15TYKCh. 21 - Design an experiment to test the hypothesis that...Ch. 21 - Peter and Rosemary Grant of Princeton University...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Using the HardyWeinberg Law in Human Genetics In a given population, the frequencies of the four phenotypic classes of the ABO blood groups are found to be A = 0.33, B = 0.33, AB = 0.18, and i = 0.16. What is the frequency of the i allele?arrow_forwardIn a population at genetic equilibrium, the frequency of the dominant phenotype is 0.96. What are the frequencies of the dominant (A) and recessive (a) alleles, and what are the expected frequencies of the AA, Aa, and aa genotypes?arrow_forwardIn plants, a trait has a narrow-sense heritability of 0.75. This indicates a) the trait is inherited from a parent 75% of the time. b) the proportion of phenotypic variance due to environmental variance. c) the degree of inbreeding from artificial selection. d) the proportion of variance due to additive alleles.arrow_forward
- In a population at Hardy-Weinberg equilibrium, 190 out of 1000 individuals have polydactyly. Note that the trait is dominant. a. What is the frequency of the dominant and recessive alleles? b. How many are expected to be heterozygotes for the trait? c. How many are expected to be homozygous dominant?arrow_forwardIn a population of squirrels in North Carolina, the heritability forbody weight is high. This means thata. body weight is primarily controlled by genes.b. the environment has little influence on body weight.c. the variance in body weight is mostly due to genetic variation.d. both a and b are correct.arrow_forwardYou perform an adoption study and you determine that for the trait observed there is a strong genetic effect. This is because you observed _______. A. similarities between the adoptees and their sibblings B. similarities between adoptees and adoptive parents C. similarites between adoptees, biological parents, and adoptive parents D. similarities between adoptees and biological parentsarrow_forward
- If two or more different genotypes do not respond to environmentalvariation in the same way, this outcome is due toa. a genotype-environment association.b. a genotype-environment interaction.c. the additive effects of alleles.d. both a and b.arrow_forwardIssues with inbreeding often occurs with dog breeds, such as German shepherds. How can we the best describe inbreeding? a. successive breeding with individuals from a variety of populations b. successive breeding within individuals from within one population c. breeding between different breeds to produce new breeds d. breeding the same set parents more than oncearrow_forwardTheHardy-Weinberg principle states that:a.genotypic changes will result in phenotypic changes.b.phenotypic changes will result in genotypic changes.c.allelic frequencies within a population will not change unless certainconditions are met.d.allelic frequencies within a population will change unless certainconditions are met.e.none of the choices apply.arrow_forward
- There is a population of cats and 16% of the cats this population show a recessive trait. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant genotype? c. What is the frequency of cats with the heterozygous genotype?arrow_forwardHuman ABO blood groups are determined by a single gene with 3 alleles: A, B, and O. In a sample of 300 individuals, 100 are blood type A and genotype AA, 100 are blood type B and genotype BO, and 100 are blood type O and genotype OO. What are the allele frequencies?arrow_forwardIn a population of mountain lions, 9% of the individuals suffer from a disease caused by a recessive allele (aa). A) Calculate the frequency of both the dominant and recessive alleles. B) What is the percentage of homozygous dominant individuals and what is the percentage of heterozygous individuals in the population?arrow_forward
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