Explain how mitosis maintains the chromosome number
of the original cells when forming new cells.

Natural selection in which a single phenotype is favored is Directional, in which extreme values of trait are favored over intermediate is disruptive and which favors stabilized phenotype is stabilizing selection.

Directional Selection

On the Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life, the seminal 1859 work by the English biologist and scientist Charles Darwin, was the first to identify directional selection as a type of natural selection.

According to the directional selection theory, an extreme phenotype—a set of features or characteristics—is preferred to other phenotypes, and as a result, the allele frequency—the frequency with which a gene variant appears in a population—shifts over time in favor of the extreme phenotype. In other words, a feature will manifest itself in the population with the highest frequency if it is favorable.

Giraffe neck lengths serve as an illustration of directed selection. Because they could reach more food in the trees, giraffes with longer necks were favored by the environment's selection pressure. At the same time, giraffes with shorter necks faced selection pressure. Both long and short necks are extreme phenotypes, but due to selection pressure over time, the long neck phenotype predominated; that is, this characteristic in giraffes moved in favor of long necks.

Stabilizing Selection

Stabilizing selection is also referred to as "middle-of-the-road" selection since it favors a non-extreme characteristic over one of the two extreme ones. Plant height is an illustration of this. Short plants may not receive enough sunlight in a population of plants, and towering plants may sustain wind damage. This causes a decrease in the number of very tall and very short plants and an increase in medium-height plants. Stabilizing selection is thought to be the most prevalent method of natural selection because most features do not change significantly over time.

Human birthweight and bird egg production are two other instances of stabilizing selection (clutch size). Human babies' birth weights keep within a range because newborns with extremely low birth weights have a lower chance of surviving and those with extremely high birth weights can cause difficulties during delivery that endanger both the mother and the baby's lives. There is a maximum number of eggs that can be laid by a certain bird species in a clutch. The clutch should contain just the right number of eggs to protect it against disease and/or predators, but not too many that the parent(s) will have trouble feeding.

Selective Disruption

Natural selection of this kind favors extreme features in a population and is bimodal. For instance, some pollinators in a population of plants will visit the tallest plants, while another species will visit the medium-height plants, and a third species will favor the lowest plants. Natural selection would favor tall and short plants, the two extreme phenotypes, and remove the pollinator that favors medium-height plants, causing medium-height plants to become less common.

The size of the beaks of finches on the Galapagos Islands, which Darwin observed, is a more well-known illustration of disruptive selection. Finches with large and small beaks (no finches with medium-sized beaks) were preferred on certain of the islands because the bulk of seeds discovered there was either huge or small.

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Answer:

Answer: Four sperm cells.  

Explanation:

Explanation: Meiosis is is a cell division process that generates four haploid cells (gametes) from a single diploid germline cell.

In the drosophila fruit fly, four haploid sperm cells are produced from a single original parent cell. The germ cells undergo meiosis to form gametes. Thus, the correct option is C.

Meiosis is the reductional division through which four daughter cells are produced from a single parent cell. The gametes are produced from meiosis. The gametes produced from a diploid cell are haploid in the number of chromosomes in cells. Both male and female gametes undergo fertilization to form diploid zygote.

Meiosis is divided into two parts- Meiosis I and Meiosis II. Both the parts comprises of four phases- Prophase, Metaphase, Anaphase, and Telophase. The chromatids undergo crossing over with non-sister chromatids to form recombination in cells.

Therefore, the correct option is C.

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Harmful mutations are always quickly weeded out of a population False .

Mutations that are harmful can result in genetic diseases or cancer. A genetic condition is an illness that results from a mutation in one or more genes. Cystic fibrosis is an example in humans. A single gene mutation causes the body to create thick, sticky mucus, which clogs the lungs and inhibits ducts in digestive organs.

Deletion mutations, on the other hand, are the polar opposite of a point mutation. They entail the elimination of a base pair. Both of these mutations produce the most damaging sort of point mutation of all: the frameshift mutation.

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Answer:

behind the functioning of the human body in health and illness,

Explanation:

Answer:

2. Si, porque de otra manera se producirían daños el medioambiente, deforestación, y degradación del suelo, el cual es un recurso no renovable.

3. Algunos ejemplos: Rotación de cultivos, mulching, abonos orgánicos o naturales, asociaciones de cultivos.

4. Si, porque no dañan el suelo.

6. La problemática se basa en un mal uso de los recursos hídricos, la falta de riego en los cultivos.

8. Si, porque como se mencionó anteriormente, un uso indiscriminado de químicos daña al medio ambiente.

Explanation:

La agricultura consiste en la práctica de cultivar plantas y criar ganado. Dicha técnica fue clave para el desarrollo de la civilización humana mediante la cual la cría de especies domesticadas y recolección de cultivos creó alimentos que permitieron a la gente vivir en ciudades. En el siglo XX, la agricultura industrial basada en el monocultivo a gran escala llegó a dominar la producción agrícola. En la agronomía moderna, el fitomejoramiento, el uso de los productos agroquímicos como los pesticidas y fertilizantes, y los desarrollos tecnológicos han aumentado considerablemente el rendimiento de las cosechas, al tiempo que han provocado daños ecológicos y medioambientales generalizados. Las prácticas modernas de cría de animales han aumentado la producción de carne, pero han suscitado preocupación por el bienestar de los animales y los daños medioambientales. Los problemas medioambientales incluyen la contribución al calentamiento global, el agotamiento de los acuíferos, la deforestación, la resistencia a los antibióticos y el uso de hormonas de crecimiento en la producción industrial de carne. Ejemplos de esta degradación del medio ambiente incluyen a la pérdida de biodiversidad, la desertificación, la degradación del suelo y el calentamiento global, que  a su vez provocan la disminución del rendimiento de las cosechas.

2. Si, porque de otra manera se producirían daños el medioambiente, deforestación, y degradación del suelo, el cual es un recurso no renovable. El uso sostenible del suelo permite conservarlo como recurso a largo plazo sin que se produzca su deterioramiento. Al no hacer uso sostenible del suelo, se pone el peligro la agricultura y a su vez la producción de alimentos. Hay que considerar que el suelo es un componente y recurso importante, un reservorio de gran parte de la biodiversidad del planeta. La vida de la flora y fauna depende del buen estado del suelo y nos resulta útil para la obtención de materia prima, siendo el área productiva del mismo limitada y bajo amenaza por los usos intensivos necesarios para satisfacer las demandas actuales. La gestión sostenible de los recursos del suelo contribuye eficazmente a prevenir el cambio climático.

3. Algunos ejemplos:

4. Si, porque no dañan el suelo, no se utilizan compuestos artificiales o contaminantes y permite un crecimiento de la vegetación de forma mas natural, sin agotar sus recursos.

6. La problemática se basa en un mal uso de los recursos hídricos, la falta de riego en los cultivos. El riego consiste en brindarle agua a los cultivos para satisfacer sus necesidades hídricas que no fueron cubiertos mediante las lluvias, entonces es necesario capacitar a los agricultores para el correcto mantenimiento de los cultivos en cuanto a la proporción de agua que se les debe brindar.

8. Si, porque como se mencionó anteriormente, un uso indiscriminado de químicos daña al medio ambiente. Como así también disminuye la calidad de la fruta, afectando su sabor y sus nutrientes.

La mosca de la fruta es un insecto que produce un daño al picar el fruto, así las hembras realizan la ovoposición generando una vía de  entrada de hongos y bacterias que descomponen la pulpa de la fruta. Esto hace que se produzca una maduración precoz y caída del fruto, y la consiguiente pérdida de cosecha. Es necesario controlar esto pero de manera responsable.

Answer:

,mm.nb,bnv

Explanation:

Answer:

An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper.

Explanation:

if it helped uh please mark me a brainliest :))

Conflict is said to be sexual when it involves sexual traits that may benefit one sex while harming the other. In this case, the conflict is usually between males and females, as they have different reproductive strategies.

One example of sexual conflict is mate choice, where males may want to mate with as many females as possible, while females may be selective and only mate with the best males.Genomic imprinting is an outcome of sexual conflict as it results from the differing interests of the maternal and paternal genomes in offspring development. Genomic imprinting occurs when only one allele from either the mother or the father is expressed, leading to differences in gene expression depending on the parent of origin. This process is thought to result from the evolutionary battle between the sexes, where females may benefit from limiting the resources invested in male offspring, while males may benefit from overproducing sperm and mating with as many females as possible. Thus, genomic imprinting can be seen as a way of resolving sexual conflict and ensuring that offspring receive the optimal combination of genes from their parents.

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Sample Response:

Bacteria are helpful because they produce oxygen, which our bodies need to breathe, and they help us to digest the food we eat. Bacteria are also helpful because they are used in medicine to help us overcome disease. Bacteria are harmful because they can cause tooth decay and illnesses that can be either common or quite serious.

This is a sample response, so it's 100% correct. Peace!

Hello! Here is your answer: Bacteria can be good, because they help produce oxygen, decompose waste, and help in medicine. They also help us digest food and live. Some other bacteria are harmful, because they can cause harmful diseases.

Hopefully, this helps!

Ask your question below!

Answer:

1 When you run a mile and then you finish and drink some water.

2. When you are outside on a cold day with no coat grabing something from the car.

Explanation:

When you are overheated, you perspire, and when you are too cold, you shiver to generate heat. The property of life that is best represented by this example is homeostasis. The correct option is A.

Homeostasis is the proper functioning of body functions. It maintains the body's internal according to the other environment. It's a self-regulating process that adjusts the body temperature and other processes of the body according to the outer environment.

When the environmental temperature changes, increases, or decreases, the body regulates accordingly, to maintain the temperature of the body, sweating happens or sweating decreases when there is a need to save the water body.

Thus, the correct option is A. homeostasis regarding the property of life that is best represented by the given condition.

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The question is incomplete. Your most probably complete question is given below:

A. homeostasis.

B. thermoregulation.

C. perspiration.

D. panting.

Answer:

Matution include changes as small as the substitution of a single DNA building block, nucleotide base, with another nucleotide base.... Other matutions result in abnormal protein product.

Answer:

b

Explanation:

i am smart

0. Normal blood and matrix sodium concentrations

1. Loss of sodium ions due to diarrhea

2. Given too much water

3. Increased matrix pressure

4. Net movement of free water into the matrix

5. Low sodium concentration

6. Abnormal neuron firing rate (neurons need sodium ions to function properly)

7. Seizures

The nerves and blood vessels that service a muscle fiber are located in the connective tissues of its d. endomysium.

The endomysium is a layer of connective tissue that surrounds individual muscle fibers. It consists of delicate connective tissue fibers and contains capillaries, nerves, and lymphatic vessels that provide the necessary oxygen, nutrients, and innervation to the muscle fiber. The endomysium serves as a protective and supportive layer for the muscle fibers, helping to maintain their structural integrity.

While the other options mentioned (myofibrils, sarcomere, perimysium, and sarcolemma) are also components of the muscle structure, they do not contain the nerves and blood vessels that service the muscle fiber.

Myofibrils are contractile structures within the muscle fiber, sarcomere is the basic functional unit of the muscle, perimysium is a connective tissue layer surrounding bundles of muscle fibers, and sarcolemma is the plasma membrane surrounding the muscle fiber. However, it is the endomysium that houses the vital vascular and nervous supply for the muscle fiber.

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Answer: The most appropriate microscope for studying the internal parts of the cell is ELECTRON MICROSCOPE. The correct option is B.

Electron microscope, which is a compound microscope is usually used to study the internal environment  of the cell because of the easiness with which one can easily distinguish the cell organelles from one another. Electron microscope gives great clarification of the cellular components and allow scientists to observe minute details about cellular structures. Electron microscope usually magnify specimens to one million times of their real sizes.

Answer:

\(\boxed{\mathrm{Electron \: microscope}}\)

Explanation:

Electron microscopes have high range of magnification and resolution, the tiniest structures of cells and organelles can be viewed through the microscope. Scientists use it for biomedical research.

Answer:The first one

Answer:

A would be the best answer

Answer:

petroleum is formed when large quantities of dead organisms, mostly zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure.

The process of protein turnover involves the synthesis and degradation of proteins.

Protein is a macronutrient composed of amino acids, the building blocks of life. It is essential for the repair and growth of our cells, organs, muscles and tissues. Protein is found in a wide variety of foods including meats, dairy, beans, nuts, and grains. Protein is essential for growth, development and maintenance of healthy bodies. In addition to its role in cell growth and maintenance, protein is also important for healthy immune systems, hormone production, and providing energy. Protein is also important for muscle maintenance and strength. It helps to repair muscle tissue after workouts and helps to maintain healthy body composition.

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The shown butterfly in the diagram is - Papilio polyxenes.

Butterflies usually are identified by the colors and patterns on their wings. To identify an organism using a dichotomous key, compare the organism’s traits to the first pair of descriptive statements on the key.

The points on the hindwings identify the butterfly as

1. Hindwings rounded ………………… Goto 3

2. Wings mainly yellow …………… Papilio glaucus

Wings mainly black ………….. Papilio polyxenes

3. Wings orange with black piping…Danaus plexippus

Wings yellow with black edges….. Colias philodice

Thus, the shown butterfly in the diagram is - Papilio polyxenes.

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Answer:

I believe it would be C. Sex-Linked recessive

Explanation:

Answer: natural gas and Biomass Fuels

hope this helps :)

Answer:

They are made of amino acids, they build muscle and form our immune system

Explanation:

1. Amino acids, held together by peptide bonds, make proteins.

2. Monosaccharide means one sugar. That would be carbohydrates.

3. The way I remember this is as follows: You eat ribs to get muscle. Since proteins are made in the ribosome, I use “ribs” as a short form of ribosome. That also helps me remember 4. They are made in the ribosome. I hope that makes sense.

5. For short term energy, we use carbs.

Hope it helps :)

During fermentation, the final acceptor for the electrons from NADH is an organic molecule produced by the metabolic pathway, such as pyruvate or acetaldehyde.

This reduction of organic molecules is what allows for the regeneration of NAD+ so that glycolysis can continue to produce ATP.

During aerobic respiration, the final acceptor for the electrons from NADH is oxygen.

In this process, NADH transfers its electrons to the electron transport chain, which uses the energy to create a proton gradient across the inner mitochondrial membrane. The protons then flow back across the membrane, driving the synthesis of ATP.

During anaerobic respiration, the final acceptor for the electrons from NADH depends on the specific type of electron acceptor that is being used.

For example, in some types of bacteria, the final electron acceptor may be nitrate or sulfate. This allows for the generation of ATP in the absence of oxygen.

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A wound infection caused by Clostridium perfringens is characterised by painful swelling, which is partially due to gas buildup, and swiftly developing subcutaneous tissue necrosis.

Anaerobic Gram-positive spore-forming bacterium Clostridium perfringens is linked to acute gastrointestinal infections in people that range in severity from diarrhoea to necrotizing enterocolitis and myonecrosis. The Clostridium perfringens (C. perfringens) bacterium is what causes the Clostridium perfringens foodborne sickness. C. perfringens is frequently found in the intestines of both people and many animals. It is also present in contaminated soil and other areas.

Clostridium species that produce toxins and gas are the source of clostridial gas gangrene, a very fatal necrotizing soft tissue infection of the skeletal muscle. Both the cause and the target tissue are best described by the term clostridial myonecrosis. Thus, anaerobic, spore-forming, and gas-producing Clostridium subspecies are responsible for the extremely rare but deadly condition known as Clostridial Gas Gangrene (GG) or Clostridial Myonecrosis.

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Answer:

it's D. waves

Explanation:

took the test on edge and got it correct

Answer:

Economic development

Explanation:

By increasing the sustainability, FSC certified owner can make more profit

A property owner who cuts fewer trees may make more profit than a non-FSC certified owner in several ways:

Increased sustainability: By cutting fewer trees, the property owner is preserving forest resources and biodiversity, which can attract environmentally conscious consumers and increase the demand for their products.

Better reputation: FSC certification is an internationally recognized symbol of responsible forest management. By obtaining this certification, the property owner can improve their public image, increase their brand recognition, and increase consumer trust in their products.

Access to new markets: Many companies and governments now require their suppliers to source products from FSC certified forests. By becoming FSC certified, the property owner may gain access to new markets and customers, increasing their sales and profitability.

Reduced costs: By reducing the number of trees cut, the property owner may reduce the costs associated with logging and timber harvesting, such as transportation and processing expenses.

In summary, by cutting fewer trees and becoming FSC certified, a property owner can improve their sustainability, reputation, market access, and reduce costs, leading to increased profits.

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Answer: Hi!

Discontinuous variations are differences in a population (for example, a group of pea plants) that can be clearly seen. For example, the peas can be wrinkled or smooth, or can have wide, short seed pods, or long, thin seed pods. These are determined by different alleles.

Hope this helps!

Answer:

Community - different species

Ecosystem -  a community is a part of the larger ecosystem

Explanation:

A community refers to the population of different species living in a specific area, interacting with one another and their environment.An ecosystem, on the other hand, encompasses both the living (biotic) and non-living (abiotic) components of a particular area