As human migrated away from the equator, what may have been a selective pressure against more melanin? O Higher UV index resulting in more vitamin D synthesis O Lower UV index resulting in less vitamin D synthesis O Cold weather and too much body hair O Lower UV index and more DNA mutations

As human migrated away from the equator, what may have been a selective pressure against more melanin? O Higher UV index resulting in more vitamin D synthesis O Lower UV index resulting in less vitamin D synthesis O Cold weather and too much body hair O Lower UV index and more DNA mutations

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Description: 18 As human migrated away from the equator, what may have been a selective pressure against more melanin?O Higher UV index resulting in more vitamin D synthesisO Lower UV index resulting in less vitamin D synthesisO Cold weather and too much body hai

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter30: Sensory Perception

Section: Chapter Questions

Problem 2CT

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Cultured Skin for Healing Wounds Diabetes is a disorder in which the blood sugar level is not properly controlled. Among other effects, it reduces blood flow to the lower legs and feet. As a result, about 3 million diabetes patients have ulcers (open wounds that do not heal) on their feet. Each year, about 80,000 require amputations. Several companies provide cultured cell products designed to promote the healing of diabetic foot ulcers. FIGURE 31.15 shows the results of a clinical experiment that tested the effect of one such cultured skin product versus standard treatment for diabetic foot wounds. Patients were randomly assigned to either the experimental treatment group or the control group, and their progress was monitored for 12 weeks. FIGURE 31.15 Treatment of diabetic food ulcers. Results of a multicenter study of the effects of standard treatment versus use of a cultured cell product for diabetic foot ulcers. Bars show the percentage of foot ulcers that had completely healed. What percentage of wounds had healed at 8 weeks when treated the standard way? When treated with cultured skin?
According to the video “The Biology of Skin Color”, why is UVB critical for humans? A. It helps our bodies break down Vitamin D, which can be toxic to our bodies. B. It helps our bodies synthesize Vitamin C, which we need in order to absorb calcium in our diet. C. UVB is not critical or useful for us. D. It helps our bodies synthesize Vitamin D, which we need in order to absorb calcium in our diet.
How does skin color throughout the world match up with UV exposure? A. Darker skin is usually found in high UV areas while lighter skin is usually found in low UV areas B. UV rays are the same throughout the world, so there is no pattern or correlation with skin color C. Skin color throughout the world does not match up with UV exposure D. Lighter skin is usually found in high UV areas while darker skin is usually found in low UV areas
What is the only statement that correctly identifies the ability of different wavelengths of UV light to penetrate the human skin? Note: UVA is the longest wavelength (least energy), and UVC is the shortest wavelength (most energy). If you've studied the electromagnetic spectrum you may remember that wavelength and energy have an inverse relationship. We'll talk more about this later in the course. Group of answer choices A- UVA light penetrates only as deep as the epidermis, which is where it has its effect B-UVB light penetrates only as deep as the epidermis, which is where it has its effect C-UVC light penetrates only as deep as the epidermis, which is where it has its effect
According to the video “The Biology of Skin Color”, how does UV exposure vary throughout the world? A. The UV rays are the same at the equator and the earth's poles B. There are higher UV rays near the equator and lower UV rays towards the north and south poles C. UV rays don't vary across the globe D. There are lower UV rays near the equator and higher UV rays towards the north and south poles
Data Analysis Activities Neanderthal Hair Color The MC1R gene regulates pigmentation in humans (Sections 13.5 and 14.2), so Loss-of-function mutations in this gene affect hair and skin color. A person with two mutated alleles for this gene makes more of the reddish melanin than the brownish melanin, resu.lti.ng in red hair and pale skin. DNA extracted from two Neanderthal fossils contains a mutated MC1R allele that has not yet been found in humans. To see how the Neanderthal mutation affects the function of the MC1R gene, Carles Lalueza-Fox and her team introduced the allele in to cultured monkey cells (FIGURE 26.12). FIGURE 26.12 MC1Ractivity. Activity is shown in monkey cells transgenic for an unmutated MC1R gene, the Neanderthal MC1R allele, or the gene for green fluorescent protein (GFP). GFP is not related to MC1R. How did MCR1 activity in monkey cells with the mutant allele differ from that in cells with the normal allele?
Cultured Skin for Healing Wounds Diabetes is a disorder in which the blood sugar level is not properly controlled. Among other effects, it reduces blood flow to the lower legs and feet. As a result, about 3 million diabetes patients have ulcers (open wounds that do not heal) on their feet. Each Year, about 80,000 require amputations. Several companies provide cultured cell products designed to promote the healing of diabetic foot ulcers. FIGURE 31.21 shows the results of a clinical experiment that tested the effect of one such cultured skin product versus standard treatment for diabetic foot wounds. Patients were randomly assigned to either the experimental treatment group or the control group and their progress was monitored for 12 weeks. FIGUR E 31.21 Results of a multicenter study of the affects of standard treatment versus use of a cultured cell product for diabetic foot, ulcers. Bars show the percentage of foot ulcers that had completely heated. 2. What percentage of wounds had healed at 12 weeks when treated the standard way? When treated with cultured skin?
Cultured Skin for Healing Wounds Diabetes is a disorder in which the blood sugar level is not properly controlled. Among other effects, it reduces blood flow to the lower legs and feet. As a result, about 3 million diabetes patients have ulcers (open wounds that do not heal) on their feet. Each Year, about 80,000 require amputations. Several companies provide cultured cell products designed to promote the healing of diabetic foot ulcers. FIGURE 31.21 shows the results of a clinical experiment that tested the effect of one such cultured skin product versus standard treatment for diabetic foot wounds. Patients were randomly assigned to either the experimental treatment group or the control group and their progress was monitored for 12 weeks. FIGUR E 31.21 Results of a multicenter study of the affects of standard treatment versus use of a cultured cell product for diabetic foot, ulcers. Bars show the percentage of foot ulcers that had completely heated. 3. How early was the healing difference between the control and treatment groups obvious?
Cultured Skin for Healing Wounds Diabetes is a disorder in which the blood sugar level is not properly controlled. Among other effects, it reduces blood flow to the lower legs and feet. As a result, about 3 million diabetes patients have ulcers (open wounds that do not heal) on their feet. Each year, about 80,000 require amputations. Several companies provide cultured cell products designed to promote the healing of diabetic foot ulcers. FIGURE 31.15 shows the results of a clinical experiment that tested the effect of one such cultured skin product versus standard treatment for diabetic foot wounds. Patients were randomly assigned to either the experimental treatment group or the control group, and their progress was monitored for 12 weeks. FIGURE 31.15 Treatment of diabetic food ulcers. Results of a multicenter study of the effects of standard treatment versus use of a cultured cell product for diabetic foot ulcers. Bars show the percentage of foot ulcers that had completely healed. What percentage of wounds had healed at 12 weeks when treated the standard way? When treated with cultured skin?
Cultured Skin for Healing Wounds Diabetes is a disorder in which the blood sugar level is not properly controlled. Among other effects, it reduces blood flow to the lower legs and feet. As a result, about 3 million diabetes patients have ulcers (open wounds that do not heal) on their feet. Each year, about 80,000 require amputations. Several companies provide cultured cell products designed to promote the healing of diabetic foot ulcers. FIGURE 31.15 shows the results of a clinical experiment that tested the effect of one such cultured skin product versus standard treatment for diabetic foot wounds. Patients were randomly assigned to either the experimental treatment group or the control group, and their progress was monitored for 12 weeks. FIGURE 31.15 Treatment of diabetic food ulcers. Results of a multicenter study of the effects of standard treatment versus use of a cultured cell product for diabetic foot ulcers. Bars show the percentage of foot ulcers that had completely healed. How early was the healing difference between the control and treatment groups obvious?
All mutations ________. a. result from radiation b. lead to evolution c. are caused by DNA damage d. change the DNA sequence
Data Analysis Activities Neanderthal Hair Color The MC1R gene regulates pigmentation in humans (Sections 13.5 and 14.2), so Loss-of-function mutations in this gene affect hair and skin color. A person with two mutated alleles for this gene makes more of the reddish melanin than the brownish melanin, resu.lti.ng in red hair and pale skin. DNA extracted from two Neanderthal fossils contains a mutated MC1R allele that has not yet been found in humans. To see how the Neanderthal mutation affects the function of the MC1R gene, Carles Lalueza-Fox and her team introduced the allele in to cultured monkey cells (FIGURE 26.12). FIGURE 26.12 MC1Ractivity. Activity is shown in monkey cells transgenic for an unmutated MC1R gene, the Neanderthal MC1R allele, or the gene for green fluorescent protein (GFP). GFP is not related to MC1R. What does this imply about the mutations effect on Neanderthal hair color?