The distribution of epidermal melanin shows a remarkable diversity in human populations and, in this sense, it is an atypical trait. Statement 1: Numerous genetic studies have indicated that the average proportion of genetic variation due to differences among major continental groups is just 10-15% of the total genetic variation. Statement 2: Skin pigmentation shows large differences among continental populations. Statement 3: The distribution of skin pigmentation can be traced back primarily to the strong influence of natural selection, which has shaped the distribution of pigmentation according to a latitudinal gradient. a. All three statements are false. b. Statements two and three are true but statement one is false. c. Statements one and two are true but statement three is false.

The distribution of epidermal melanin shows a remarkable diversity in human populations and, in this sense, it is an atypical trait. Statement 1: Numerous genetic studies have indicated that the average proportion of genetic variation due to differences among major continental groups is just 10-15% of the total genetic variation. Statement 2: Skin pigmentation shows large differences among continental populations. Statement 3: The distribution of skin pigmentation can be traced back primarily to the strong influence of natural selection, which has shaped the distribution of pigmentation according to a latitudinal gradient. a. All three statements are false. b. Statements two and three are true but statement one is false. c. Statements one and two are true but statement three is false.

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 20QP: Natural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal...

See similar textbooks

Similar questions

What factors caused the correlation between the reduction in skin pigmentation in humans and migration of human populations away from the equator? The exposure of human populations to predators only common to the polar regions caused them to adapt by camouflaging better with the environment. The exposure of human populations to less UV light required a reduction in melanin to produce more vitamin D for healthier bones. The exposure of human populations to new sources of food common to the polar regions caused changes in physiology that resulted in the production of less melanin. The exposure of human populations to new diseases common to the polar regions interferred with melanin production causing lighter skin.
What is the evidence that the differences in skin color in populations around the world evolved by natural selection?
Summarize how natural selection is the mechanism that produced a global cline of skin color. Your answer should include an explanation of therelationship between melanin, geography, UV radiation, folate, and vitamin D.
Which factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection? the impact of UV radiation on folate and Vitamin D levels in human populations the clothing worn by humans in the early 8th century the interaction of human populations with predators in colder climates a change in the diet of human populations as they settled in colder climates
Why is reduced pigmentation of the skin advantageous for individuals from northern latitudes? What role does darker pigmentation serve for individuals near the equator? What is the relationship between skin pigmentation and fitness?
Based on everything that you have learned so far, provide an explanation for how the different shades of skin color from pinkish white to dark brown evolved throughout human history.
Explain the roles of Vitamin B and Vitamin D in the evolution of skin color. Use appropriate anthropological terms (such as "natural selection" and "phenotype") Be sure to discuss both Vitamin B folate and Vitamin D as they have different effects?
Why is it that the evolution of skin color is considered a case of natural selection? Group of answer choices A- Because different alleles in skin color genes lead to differences in skin color B- Because differences in skin color lead to differences in number of children in different environments C- Both D- Neither
Watch the film from time stamp 5:49 minutes to 9:08 minutes. Pause when Dr. Jablonski says, “That suggests that variation in human skin melanin production arose as different populations adapted biologically to different solar conditions around the world.” III. After watching this segment of the film, answer Question 10. 10. Based on what you know about skin pigmentation so far, suggest a mechanism by which UV intensity could provide a selective pressure on the evolution of human skin color. In other words, propose a hypothesis that links skin color to evolutionary fitness. IV: What Was the Selective Pressure? Watch the film from time stamp 9:08 minutes to 12:19 minutes. Pause when Dr. Jablonski says, “For that reason, though it might cut your life short, it’s unlikely to affect your ability to pass on your genes.” After watching this segment of the film, answer Questions 11–12. 11. What does it mean for a trait, such as light skin coloration, to be under…
So if skin color selection is not related to cancer, what accounts for the difference in skin color of different human populations? Meaning where is the selective pressure coming from to explain the differences in skin color?
Evidence for biocultural evolution during the Upper Pleistocene may exist in the form of craniofacial morphological differences between premodern humans and modern humans because, as one interpretation mentioned in your text suggests… Group of answer choices deep concentration on the creation of cave art murals resulted in the selection for more gracile craniofacial morphology in modern humans hunter gatherers used landscape surveying methods to hunt and gather resources, a practice that required long periods of squinting resulting in supraorbital browridge muscle robusticity frequent spiritual rituals focused around chanting practices resulted in enlarged craniofacial muscle attachments basket weaving techniques required the use of the teeth as a clamp to temporarily hold the sinew technological innovations assisting with food processing resulted in anatomically modern humans not needing large teeth and facial muscles to chew and process their foods
A cladogram shows the evolutionary relationship between humans, chimpanzees, and gorillas. The cladogram currently shows humans and chimpanzees with a more recent common ancestor compared to gorillas. Which piece of evidence, if true, would most likely weaken this hypothesis? Amino acid analysis of the cytochrome shows significant differences in the sequence of amino acids between humans and goriffas. DNA sequence analysis of the hemoglobin alpha gene shows that humans and chimpanzees have a more similar sequence to each other than they do to the gorilla's DNA sequence. The cells of the eye in embryos of gorillas and humans follow a similar pattern of development chimpanzee embryos are different Fossils of humans appear in deeper sedimentary rock layers compared to fossils of chimpanzees.