Which of the following has been favored by natural selection for populations living near the equator to protect against high levels of UV radiation and to prevent degradation of folate? Group of answer choices evaporative cooling vasodilation lighter skin darker skin lactase persistence
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- Human Skin Color: Evidence for Selection Name: Jayden Bodisto Make observations of the Figure below. Then complete the portion below. Erythemal UV index 80 0 09- KNMI/ESA -120 0 -120 2 4 -60 6 8 10 60 Clear-sky 24 September 2015 120 10 60 12 14 120 16 -60 18 Figure 1. Ultraviolet Radiation Index Across the World. The colors on this map of the world represent Ultraviolet (UV) Index values on a particular day in September 2015. The UV Index is a standardized scale of UV radiation intensity running from 0 (least intense) to 18 (most intense). The y-axis values are degrees of latitude, which range from the equator (0°) to the poles (90° north and -90° south). The x-axis values are degrees of longitude, which range from the prime meridian (0°) to the antimeridian (180° east and -180° west). (Source: European Space Agency, http://www.temis.nl/uvradiation/UVindex.html.) The Driving Question: What is the relationship between UV radiation and skin color? What do I see? List specific things you…Describe mechanisms (random mutation, natural selection, reductive evolution) that contribute to the appearance of diverse traits in a population and explain how growth habitats can affect the prevalence of individual traits. Apply this knowledge to the evolution of antibiotic resistance in pathogen populations.Differences between Simpsons diversity index and Shannon diversity index
- We know that lighter skin evolved more than once because the SLC24A5 gene is missing from some populations. Question 17 options: True FalseThis term is used to describe the largely theoretical possibility that individuals may grow and display some physical marker to indicate to others of the same species the presence of common genes: Group of answer choices Gene-Culture Challenge Westermarck Effect Green-beard Effect Hamilton's RulePlease help with the following: 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. Statements two and three are true but statement one is false. B. Statements one and three are true but statement two is false. C. Statements one and two are true but statement three is false. D. All three statements are true. E. All three statements are false.
- GWhat question could be aske X GResearchers can geneticallys X ck X Flock Y Flock Z Total x XVT-FL-EOC-Biology 1 - Edger X genuity.com/Player/ Lab: Natural Selection Assignment: Reflect on the Lab Active Apply the Simulation to the Real World Researchers can genetically select lettuce crops to cultivate for pest resistance. One of the concerns scientists have about genetically selected crops is that some traits for pest resistance may affect the texture of lettuce. What question could be asked to begin this investigation by looking at a measurable dependent variable? * What is the effect of crop selection for pest resistance on the distribution of leaf size in a population of plants? O What is the effect of crop selection for pest resistance on the toughness of lettuce leaves? O What is the effect of crop selection for pest resistance on the sale of green salad in grocery stores? What is the effect of crop selection for pest resistance on the texture most preferred for consumption by…Over the past several decades, natural selection has caused populations of Staphylococcus aureus (an infectious wound bacterium) to evolve resistance to most antibiotics. If antibiotic use were stopped, what would you predict would happen to these S. aureus populations? The frequency of resistant forms will continue to increase in the population They will likely become extinct without the presence of the antibiotic They will likely stop mutating and developing new resistance mechanisms The proportion of non-resistant forms in the population is likely to increase The resistance gene will disappear from the population rapidlyYour friend remarks, "The giraffe stretched its neck while reaching for higher leaves; as a result, its offspring inherited longer necks” Which statement is the best response to correct your friend’s misconception? Group of answer choices Overproduction of offspring leads to a struggle for survival. Disuse of an organ may lead to its eventual disappearance. Characteristics acquired during an organism's life are generally not passed on through genes to its offspring. Only favorable adaptations have survival value.
- 600 90°N 60°N 500 30°N 0° 400 Insolation 300 (Wm²2) 200 100 J'F MA MJJA s'o'N`D Month The skin tone of a native population living at 60°N would most likely be dark to increase production of Vitamin D. dark to protect DNA and folate. light to increase production of vitamin D. light to protect DNA and folate. --March Equinox- - June Solstice- -September Equinox- || December Solstice-How does skin cancer not exert enough evolutionary pressure to account for darker skin in humans? How does folate deficiency exert enough evolutionary pressure to account for darker skin in humans? What is one indispensable function of UVB rays in the human body? How does this exert evolutionary pressure on human skin color? Briefly describe the 2 reasons why the Inuit people exhibit somewhat darker skin levels than would be predicted given the UV levels at their latitude. What theory do the authors propose for why women generally have lighter skin than men? Briefly explain why skin color is described as “one of the least useful characteristics in determining the evolutionary relations between human groups”?The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes?* nd 2 chool The proportion of DDT-resistant mosquitoes in a population remains constant due to O the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1.492 finches is intróduced to a rainforest. Over the next year, the finches show a death rate of…