Which of the following is correct?
a. To know what has been spread recently by natural selection we only have to know what alleles are currently at high frequency in the population.
b. Many genes favored by recent selection provide resistance to disease.
c. Generation by generation recombination lengthens haplotypes.
d. Neanderthal genes provided no fitness benefits to Homo sapiens sapiens.
e. None of the above is correct.
Answers
The correct statement is: option (b) which states "many genes favored by recent selection that provides resistance to disease".
Natural selection is a basic mechanism of evolution that promotes the reproduction of individual organisms with the most advantageous traits in a given environment. Natural selection is a key process that explains the changes in gene frequency and provides a long-term explanation for the evolution of species.
The correct statement in this question is explained below. Many genes favored by recent selection provide resistance to disease. Recent natural selection results in a rapid increase in the frequency of certain genetic traits within a population.
For instance, many genetic variations that are associated with resistance to diseases have emerged under recent natural selection, which is often driven by environmental pressures such as pathogens that can make the survival of individual organisms difficult.
In contrast, some genetic variations may have negative impacts on individuals' survival, which decreases their fitness, causing them to have fewer offspring. Therefore, only the genetic variations that are advantageous to the individuals, with increased chances of survival, are favored by natural selection.
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Related Questions
Have all species on Earth evolved from a common ancestor?
Answers
Explanation: it’s alright to be confused.
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As the Black Death spread in the mid-14th century, which region tended to experience the
greatest loss of life?
A) Urban areas
B) Rural Farms
C) Remote villages
D) Mountainous areas
Answers
Answer:
urban areas
Explanation:
because the population of urban areas in those countries is more then villages.
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Answers
Answer:i think blood sugar i d k but maybe you right
Explanation:
Answer:
bdnnddnndndnxnxxnxnbxbxbdbdbd
The blue color of the sky results from scattering of sunlight by air molecules the blue light has a frequency of 7.5x10^14Hz calculate the wavelength (in meters) associated with this radiation
Answers
Answer:
Explanation:
Electromagnetic waves all travel at the speed of light when in vacuum, and essentially this same speed in normal air. Since wave speed is product of frequency and wavelength, c = f λ and λ = c/f = (3.00 x 108 m/s) / (7.5 x 1014 Hz) = 4.00 x 10-7 m = 400 x 10-9 m = 400 nm.
What trait do all solar system models share?
All planets have epicycles.
O The moon orbits Earth.
The stars rotate around the Sun.
O The planets have a circular orbit around the Sun.
Answers
Answer:
it's answer is : The planets have a circular orbit around the sun.
Explanation:
The traits that all the solar system models do share is that they have a circular orbit around the sun. The planets are located at different distance from the sun and revolve around the sun from a different distance. The nearest is mercury and the most far planet is Neptune.
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Explanation:
The moon orbits Earth
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The process of ecdysis in the arthropoda and nematoda occurs immediately following a change a. in larval to adult stage b. in increased body size c. in behavioral eating strategies. d. in gender among hermaphroditic adults e. during metamorphosis
Answers
The process of ecdysis, or molting, in arthropods and nematodes occurs immediately following a change in increased body size. Ecdysis is a crucial part of their life cycle, allowing them to shed their old exoskeleton or cuticle and replace it with a new, larger one to accommodate their growing bodies.
This process is triggered by hormonal changes and is necessary for their continued development and growth.
Option a, "in larval to adult stage," is not accurate because ecdysis can occur multiple times throughout the life cycle of arthropods and nematodes, not just during the transition from larval to adult stage.
Option c, "in behavioral eating strategies," is not directly related to ecdysis but rather to feeding behaviors.
Option d, "in gender among hermaphroditic adults," is not specifically linked to ecdysis but may be associated with sexual maturation or reproductive processes.
Option e, "during metamorphosis," is partially correct. Ecdysis can occur during metamorphosis in certain species, such as insects, where it is a crucial part of the transformation from larval to adult form. However, it is important to note that ecdysis also occurs in other life stages of arthropods and nematodes, not just during metamorphosis.
In summary, the accurate statement is that ecdysis in arthropods and nematodes occurs immediately following a change in increased body size, which allows them to shed their old exoskeleton and grow a new one.
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which era characterized by the extinction of reptiles and the appearance of mammals is considered significant in geological history
Answers
Answer:
Mesozoic Era
Explanation:
The "Mesozoic Era" is divided into three periods: Triassic, Jurassic and Cretaceous. During the last period (Cretaceous), which was considered the longest, the extinction of reptiles occurred and the new mammals appeared. This event was also known as the "Cretaceous-Paleogene Extinction Event." Around 3/4 of plants and animals died. Such event became significant boundary that laid between the Cenozoic Era and the Mesozoic Era. This made it significant in geologic history.
Answer
The right answer is c
Answers
Explanation:
what are ovum sea-jbgp-hgh g I ls c o m e pl s
I have only two hats, a red one and a black one. I have only two
belts, a blue one and a white one. I have only two ties, one with a
DNA molecule prominently showing on it and the other with
2n promin
Answers
As per the details given, using probability there are 8 possible combinations of hats, belts, and ties.
You need to know the entire number of possible combinations and the total number of positive outcomes in order to determine the likelihood of a certain arrangement of hats, belts, and ties happening.
You may get the total number of combinations by multiplying the number of options for each item (hats, belts, and ties), as each has two options.
In this instance, you have two hat options (red or black), two belt options (blue or white), and two tie possibilities (DNA or 2n). Consequently, there are the following combinations in all:
2 (options for hat) * 2 (options for belt) * 2 (options for tie) = \(2^3\) = 8
Thus, there are 8 possible combinations of hats, belts, and ties.
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Your question seems incomplete, the probable complete question is:
I have only two hats, a red one and a black one. I have only two belts, a blue one and a white one. I have only two ties, one with a DNA molecule prominently showing on it and the other with 2n prominently showing on it. Every day I wear one hat, one belt and one tie, all chosen at random. How many possible combinations of hats, belts and ties exist?
In what form is the vast majority of corn consumed?
Answers
Corn is used as the main energy ingredient in livestock feed and as a food factor for humans.
12. Which of the following would exert pressure on a population of squirrels?
a. Disease
b. Predators
C. Availability of food
d. All of the above
Answers
-squirrels carry diseases
-many animals hunt squirrels
-food is limited
Are bloat, hardware, or stomach displacements common in llamas?
Answers
Yes, bloat, hardware disease, and stomach displacement are common in llamas due to several factors, and can lead to serious health problems if not treated promptly.
These conditions can be caused by several factors, including changes in diet, feeding practices, and management, and can lead to serious health problems in llamas. Bloat is caused by the accumulation of gas in the stomach, while hardware disease occurs when a llama ingests a foreign object that becomes lodged in the digestive tract. Stomach displacement can occur when the stomach twists or rotates, leading to a blockage of the digestive system. It is important for llama owners to be aware of the symptoms of these conditions and to seek veterinary care immediately if they suspect their llama may be affected.
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the most basic concepts of cell thoery are that cells are the basic unit of life and all living things are made of cells. which answer correctly explains why these concepts are the basis of a thoery and not a hypothesis? A. cell theory explains how cells function rather than predicting how they function. B. cell theory does not change and as a result can be accepted as fact. C. cell theory is a prediction based on observation and not fully accepted idea. D. cell theory remains largely untested rather than being subject to testing.
Answers
Answer:
D.
Explanation:
That is the definition of theory
Which sentence from the article supports a MAIN idea from the article?
(A) In modern America, we have access to fresh water every day.
(B) Each time we turn on the tap, plumbing systems bring this important resource into our homes.
(C) The remaining water is salt water, such as what is found in the ocean.
(D) This lack of water affects business and politics in different places.
Answers
Answer:
could you upload the article with the question please?
Explanation:
in an ames test, bacteria that start producing histidines are called revertants. question 8 options: 1) true 2) false
Answers
An ames test, bacteria that start producing histidines are called revertants is True.
In an Ames test, bacteria that start producing histidines are indeed called revertants. Revertants are mutant bacteria that regain the ability to synthesize histidine due to a reversion of the original mutation. This is a key principle of the Ames test, a widely used bacterial mutagenicity assay that detects potential mutagens by measuring their ability to induce mutations in the histidine biosynthesis pathway of bacteria.
By observing the appearance of revertants, which are able to grow in histidine-deficient media, researchers can assess the mutagenic potential of a test substance. The number of revertant colonies formed is compared to a negative control to determine the mutagenicity of the substance being tested.
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what are the briefly information about plant cell
Answers
Answer:
Plant cells are the basic unit of life in organisms of the kingdom Plantae. They are eukaryotic cells, which have a true nucleus along with specialized structures called organelles that carry out different functions. Plant cells have special organelles called chloroplasts, which create sugars via photosynthesis.
What are three types of population distribution and explain each
Answers
10% of energy gets passed on to the next highest trophic level. we measure this is calories. this means in order to calculate how much energy is passed on in calories, we multiply the thing getting eaten by 10%. how many calories gets passed on to the secondary consumer if it eats a primary consumer with 200 calories?
Answers
Secondary consumer would receive 20 calories of energy by consuming primary consumer.
What is primary and secondary consumer?Organisms that eat the producers are called primary consumers. They are small in size and there are many of them. Primary consumers are herbivores but organisms that eat primary consumers are meat eaters (carnivores) and are called secondary consumers.
If a primary consumer has 200 calories, and only 10% of that energy is passed on to the secondary consumer, then the amount of energy passed on in calories can be calculated as:
200 calories x 0.10 = 20 calories
Therefore, secondary consumer would receive 20 calories of energy by consuming the primary consumer.
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Which of the following statements does NOT describe a river delta?
A. sediment that builds up where a river meets a larger body of water
B. some are muddy and unstable; others are so big crops can grow on them
C. earth scooped out that can form a lake or deep valley
D.where a flowing river empties its load at the mouth of a river
Answers
Answer:
C: Earth scooped out that can form a lake or deep valley
Answer:
letter C po Ang answer
Explanation:
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which is the acceptable administration route for Vincristine?
A-intrapertoneal
B-intravenous
C-intravesicular
D- intrathecal
Answers
The acceptable administration route for Vincristine is intravenous (IV). The correct option is B
What is Vincristine ?Leukemia, lymphoma, and sarcoma are just a few of the cancers that are handled by the chemotherapy medication vincristine. Because it is a vesicant, if it seeps out of a vein, it can seriously harm tissue. Vincristine should only be given intravenously for this reason.
The other options are not suitable ways to administer vincristine. To administer medication straight into the abdomen, employ intraperitoneal (IP) administration. Medication is delivered directly into the bladder through intravenous (IV) injection. Medication is delivered directly into the cerebrospinal fluid by intrathecal (IT) injection. Because it might have major side effects such paralysis and nerve damage, vincristine is normally not given through these routes.
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Please answer fast!
worth 100 points
Answers
Answer:
self feeder; E from sun or chemicals - autotrophs
has a nucleus & membrane-bound organelles - eukaryote (5)
the smallest taxonomic division - species (4)
no nucleus or membrane bound organelles - prokaryote (6)
one organism living inside another, both benefit - mutualism
two term - binomial (1)
Explanation:
At which type of plate boundary do tectonic plates slide past each other? (1 point)
O at convergent boundaries
O at transform boundaries
O at divergent boundaries
O at oceanic-oceanic boundaries
Answers
Tectonic plates are the massive, moving pieces of the Earth's crust. At a transform boundary, two plates slide past each other in opposite directions, with no creation or destruction of crust. This type of boundary is often marked by earthquakes, as the plates grind and rub against each other. Examples of transform boundaries include the San Andreas Fault in California and the Alpine Fault in New Zealand.
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Down's syndrome is a condition where an extra chromosome is produced on the _____ chromosome.
Answers
Answer: On the Y chromosome
Answer: 21th
Explanation: Down syndrome a.k.a trisomy 21 because it’s caused by an extra copy of a chromosome 21.
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Which ecosystem services can also affect the biodiversity of an ecosystem?
Answers
The ecosystem services that can also affect the biodiversity of an ecosystem include pollination, nutrient cycling, and pest control.
How do pollination, nutrient cycling, and pest control contribute to the biodiversity of an ecosystem?Pollination helps maintain plant biodiversity by ensuring that different plant species are able to reproduce and create new genetic diversity. Nutrient cycling helps support the growth of a diverse range of plants, which in turn provides habitat and food for other species. Pest control helps prevent the over-consumption of certain plant or animal species, which can help maintain a healthy balance of biodiversity within an ecosystem.
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How does a change in the biodiversity of an ecosystem affect humans?
Answers
Answer:
Biodiversity loss can have significant direct human health impacts if ecosystem services are no longer adequate to meet social needs. Indirectly, changes in ecosystem services affect livelihoods, income, local migration and, on occasion, may even cause or exacerbate political conflict.
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why do i exist?A. we don'tB. we are all in a simulationC. when a mommy and a daddy get together....D. long words
Answers
Do the ion-concentration differences between resting potential and the end of an action
potential surprise you? Why or why not?
Answers
The ion-concentration differences are not surprising as they are a result of ion channel activity and ion pumps.
The particle fixation contrasts between resting potential and the finish of an activity potential don't shock me since they are a consequence of the movement of particle diverts in the cell layer. During resting potential, the centralization of sodium particles is higher external the phone, while the grouping of potassium particles is higher inside the phone. This is kept up with by the activity of particle siphons that effectively transport particles across the film. During an activity potential, particle channels open, permitting sodium particles to stream into the phone and potassium particles to stream out of the phone. This makes an impermanent inversion of the fixation slope, which is then reestablished by the particle siphons. This interaction requires energy and time, which is the reason the particle focuses are different toward the finish of an activity potential. Generally speaking, the particle fixation contrasts mirror the mind boggling and dynamic nature of cell physiology, and they are fundamental for the legitimate working of the sensory system.
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your instructor gives you an unknown organ for you to examine and identify through microscopy. what should you do first with the sample?
Answers
When examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.
What is a preservative?A preservative is a specific chemical compound used to conserve a biological sample.
In microscopy, preservatives are very useful to study the anatomy of body parts and their cells.
In conclusion, when examining an unknown organ and identifying it through microscopy, it is required fix it with preservative.
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which are the main stages of the cell cycle?
Answers
Answer:
The cell cycle is composed of interphase (G₁, S, and G₂ phases), followed by the mitotic phase (mitosis and cytokinesis), and G₀ phase.
Explanation:
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Kyle is a 50-year old business executive who admits that he has not been getting enough exercise for the last several years. He decides to take up hiking and finds that he really enjoys it. Over the next 2 years, most of Kyle’s weekends are spent hiking with a heavy backpack and camping in the beautiful mountains. Describe what changes in his anatomy could be predicted from Wolff’s Law of Bone.
Answers
Answer:
his bones got denser due to the fact of gravity and his muscle fibers