BELK SCIENCE F/LIFE-MASTRG. BIOL.AC+EBK
6th Edition
ISBN: 9781323907634
Author: BELK
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 13, Problem 8LTB
All of the following statements support the hypothesis that humans cannot be classified into biological races except.
- There is more genetic diversity within a racial group than average differences between racial groups;
- Alleles that are common in one population in a racial group may be uncommon in other populations of the same race;
- Geneticists can use particular SNP alleles to identify the ancestral group(s) of any individual human;
- There are no alleles found in all members of a given racial group;
- There is genetic evidence of mixing among human populations occurring thousands of years ago until the present.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Which of the following are true about human variation? (Choose all that apply):
Group of answer choices
Genotype refers to how a person looks, through interaction of genes and environment.
Siblings are more like each other, genetically, than they are to either of their parents.
Usually, it is only identical twins (or sometimes triplets or other multiple births) who have identical DNA, and even so, there is still some phenotypic variation between them.
You could have genes for being tall, but if your mother (or even grandmother) had poor nutrition during fetal gestation, you could be shorter than your genes allow.
You can produce taller offspring by stretching and remembering to stand up as tall as you can.
The classical twin study is established as the definitive study design for investigating the relative importance of genetic and environmental factors to traits and diseases in human population.
Monozygotic (identical) twins share all of their genes, while Dizygotic(fraternal) twins share only about 50 percent of them, the same as non-twin siblings. If a researcher compares the similarity between sets of identical twins to that of fraternal twins for a particular trait, then any excess likeness between the identical twins should be due to genes rather than environment.
Write an information leaflet evaluating the benefits and dilemmas in the use of human twin studies to investigate the causes of variation.
Albinism is rare in most human populations, occurring at a frequency of about 1 in 20,000 people. However, the trait occurs at a frequency of 1 in 200 in certain Hopi villages of Black Mesa in Arizona. In light of this example and others that you might be aware of, what can you conclude about particular alleles such as the allele for albinism?
Any allele that leads to an abnormal phenotype will be rare in most populations but common in Native American populations.
Alleles that produce abnormal phenotypes are never beneficial.
An allele that leads to an abnormal phenotype may be beneficial in some environments but harmful in others.
An allele that leads to an abnormal phenotype will rise in frequency after many generations.
An allele that leads to an abnormal phenotype will soon disappear from a population.
Chapter 13 Solutions
BELK SCIENCE F/LIFE-MASTRG. BIOL.AC+EBK
Ch. 13 - Define biological species.Ch. 13 - Prob. 2LTBCh. 13 - Prob. 3LTBCh. 13 - Prob. 4LTBCh. 13 - Prob. 5LTBCh. 13 - Prob. 6LTBCh. 13 - The biological definition of race corresponds to...Ch. 13 - All of the following statements support the...Ch. 13 - Similarity in skin color among different human...Ch. 13 - Prob. 10LTB
Additional Science Textbook Solutions
Find more solutions based on key concepts
Gregor Mendel never saw a gene, yet he concluded that some inherited factors were responsible for the patterns ...
Campbell Essential Biology (7th Edition)
4. 38 Strontium has four naturally occurring isotopes, with mass numbers 84, 86, 87, arid 88.
a. Write the atom...
General, Organic, and Biological Chemistry: Structures of Life (5th Edition)
An obese 55-year-old woman consults her physician about minor chest pains during exercise. Explain the physicia...
Biology: Life on Earth with Physiology (11th Edition)
Describe the role and impact of microbes on the earth.
Microbiology Fundamentals: A Clinical Approach
On what molecule does the anticodon appear? Explain the role of this molecule in protein synthesis.
Human Physiology: An Integrated Approach (8th Edition)
Knowledge Booster
Learn more about
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
- Which of the following best differentiates between genotype and phenotype? Genotype is an organism's genetic makeup, and phenotype is the observable traits of an organism Genotype is the observable traits of an organism, and phenotype is an organism's genetic makeup Genotype and phenotype both refer to an organism's genetic makeup Genotype and phenotype both refer to the observable traits of an organismarrow_forwardSelection confers a reproductive advantage to individuals based on their adaptations, and therefore causes the alleles carried by those individuals to increase in the population. Selection can be simulated by having your partner remove any three individuals of a particular suit as you deal the cards into a pile. The fitness of that variant is therefore 0.77 (10/13 survive), while the fitness of the other three variants remains at 1.0 (13/13 survive). Recalculate allelic (suit) frequencies after selection. 1. What is the effect of selection on reproduction, allelic diversity, and frequency? 2. What would happen if similar selection continued over several generations? Cite references.arrow_forwardWhich of the following BEST describes the relationship between genotype, phenotype, traits, and the environment? O Organisms acquire traits during their lifetime that alter their phenotype. This allows individuals to better adapt to their surroundings, and to pass on their phenotypes to their offspring regardless of their genes. An organism's phenotype is largely determined by its genes, or genotype. The relationship between an organism's phenotype and its environment determines the frequency of traits in a population. O The relationship between an organism's environment and its genotype determines the type of phenotype it will develop. Phenotypes are largely determined by the environment and organisms display traits that are unrelated to their genes.arrow_forward
- In order for a trait to evolve via natural selection, which of the following must be true regarding the trait? (this is a multiple answer question - so select all correct) Group of answer choices There must be variation in the trait. The trait must make the organism survive longer than organisms with different traits. The trait must confer a reproductive advantage on the bearer of the trait. The trait must be heritable. The trait does not necessarily need to be passed down to offspring.arrow_forwardNASA is planning on sending a colony of Snow Monkeys to mars to determine how evolution will progress outside of our planet. They have calculated the following for 226 individuals: Observed Genotype Frequencies (not in HWE) AA: 0.392 Aa: 0.445 aa: 0,163 If this population was in Hardy Weinberg Equilibrium, what would be the expected number of individuals for the homozygous recessive? Retain 1 decimal place.arrow_forwardThe Hardy–Weinberg principle states that allele and genotype frequencies remain constant from one generation to the next, as long as specific conditions are met.Choose Yes or No for the conditions that must be met from the provided statements below. Mutations are exponentially occurring. All members of the population breed. Everyone produces the same number of offspring. The population is infinitely large. There is no migration in or out of the population. No net mutations are occurring. Natural selection of beneficial traits is occurring. Natural selection is not occurring. All mating is completely random. Offspring are able to migrate out of the population.arrow_forward
- Some genetic disorders are caused by autosomal recessive alleles. Many such alleles are recessive lethals, causing lethality very early in life (say, before the age of 20 yrs). Intuitively one might suggest that selection working on human population should completely remove such alleles from the population. Yet, there are many examples of such lethal genetic disorders occurring in low frequency in several human populations. Why is it almost impossible to completely remove these seemingly fitness-detrimental alleles from the population? Under what condition, extinction of such an allele from a population can be achieved?arrow_forwardThe human genome has been fully mapped by the Human Genome Project. Information on the human genome is now freely available on DNA databases. Which statement best describes an ethical issue concerning the Human Genome Project? Responses The money invested in this project can be utilized for other research. The money invested in this project can be utilized for other research. The complete information about the human genome can be utilized to map human ancestry. The complete information about the human genome can be utilized to map human ancestry. The complete information about the human genome can lead to devastating consequences on Earth’s biodiversity. The complete information about the human genome can lead to devastating consequences on Earth’s biodiversity. The human genome will provide information about inherited diseases, which raises the possibility of genetic manipulation in individuals.arrow_forwardMany genetic disorders, such as cystic fibrosis and sickle-cell disease are due to mutations in a recessive allele. You have sampled an isolated population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate: 1g. the frequency of the recessive phenotype if "A" is completely dominant over "a” (round to the nearest hundredth)arrow_forward
- There are particular factors that cause the diversity in a gene pool to change. For each of the following statements, select the correct factor from the menu on the attached picture that is being described. The process by which organisms with certain heritable traits survive, passing on their traits to the next generation; determined by the environmental conditions of the time A change in allele frequencies caused by chance events in a small gene pool The movement of alleles into or out of a population by immigration or emigration The process of choosing mates based on the presence of certain traits or phenotypes and, thus, genotypes; traits are usually displayed in some form of courtship ritual A type of genetic drift that occurs when a natural disaster thins the population to a small group that happens to be unrepresentative of the original group; allele frequencies of the two groups will be dissimilar A type of genetic drift that occurs when a small population that is not…arrow_forwardHuman immunodeficiency virus entered human populations after evolving from a simian immunodeficiency virus. Nikolaas Tinbergen (1963)1 proposed explaining shifts in traits from two perspectives: dynamic versus static, and proximate versus ultimate. This framework can be used to understand the evolution of a trait in four ways: (i) causation (proximate/static): the mechanism of the trait as it works in the present; (ii) survival value (ultimate/static): how function of the trait enhances survival or reproduction; (iii) ontogeny (proximate/dynamic): the development of the trait in an individual; and (iv) evolution (ultimate/dynamic): the phylogenetic history of the trait. Use these categories to discuss the causes for the virus shifting to humans from other primates.arrow_forward"Ancestry tests" are sold by many companies. There are significant limitations to these tests. Why is this the case? High rates of gene flow between populations reduce the reliability with which any sequence can demonstrate membership in one particular population. Evaluating too few genetic loci, of which just a small number happen to be similar, can lead to the conclusion that individuals are much more genetically similar than they actually are. A DNA match between two individuals living today is not a match with an ancestor. Rather, it suggests that the two people may have inherited the DNA sequence from a common ancestor. all of these are limitations to "Ancestry tests" O High genetic variation among individuals within most populations makes it difficult to identify specific sequences that can reliably indicate membership in a population.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
Genetic Variation and Mutation | 9-1 GCSE Science Biology | OCR, AQA, Edexcel; Author: SnapRevise;https://www.youtube.com/watch?v=bLP8udGGfHU;License: Standard YouTube License, CC-BY