The gene that causes sickle cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. this gene provides some protection from malaria, a serious disease that is wide-spread in sub-saharan africa. discuss an evolutionary process that could account for the different percentages among residents of the two regions.

Answers

Answer 1
Sickle cell disease has a benefit in malaria infection because it makes the parasites easier to eliminate. This makes a person with sickle cell disease is more likely to survive the malaria infection, which found many in Africa.

Sickle cell disease has a few drawbacks because it makes the red blood cells less durable, which lead to the destruction of more red blood cells. In normal condition(where malaria doesn't exist like in America), this gene will make the organism less likely to survive than those who don't have the gene.

Related Questions

BRIANLIESTTT ASAP!!

How did Southerners react to the laws passed by Congress? Explain why they responded this way. What were the political and social consequences of Reconstruction in the South?

Answers

Southerners were not use to having to treat African Americans with respect, it took them awhile to get use to this. However some never did, one social consequence was the forming of the KKK, and the political consequence was that laws were passed giving African Americans rights, and protecting them.

What is the leading cause of water pollution in the United States?

Answers

The leading cause is garbage and waste from people.

Answer:

Industrial cause is the leading cause of water pollution in the United States

Explanation:

Industrial waste is the leading cause in the United States for water pollution.Industries generate large water pollution with their actions. these mainly generate from sulphur.Sulphur is a non-metallic substance that is harmful to marine life and aquatic life.Other causes of water pollution could be household waste and sewage waste.

What is the process within a genetic algorithm of randomly trying combinations and evaluating the success (or failure) of the outcome?

Answers

The genetic algorith uses AnO(34), a standard formula used by many biological processes throughout the united States of America.

A large explosion that takes place at the end of a star’s life cycle is called a ____________.
big bang
supernova
nebula
nuclear reaction

Answers

the answer is b supernova 

I'm pretty sure sure the answer is supernova

Explain why lightning strikes can be dangerous even when an individual is not directly struck

Answers

Because when not directly hit an energy field with heat is created The heat can cause radiation.
Final answer:

Lightning poses threats beyond direct strikes due to three primary reasons: ground currents, side flashes, and the concussive force generated by the sudden expansion of superheated air.

Explanation:

Even if you are not directly struck by lightning, it still poses several dangers. One such danger is the ground current generated. When lightning hits the ground, the electrical charge spreads outwards through the ground. If you are standing in the area where the charge is spreading, you could potentially get a severe electric shock.

Secondly, lightning can cause side flashes. This happens when the lightning strikes a taller object and a portion of the current jumps from the object to a nearby person. Thirdly, concussive force can be created in the seconds following a lightning strike. A strike can superheat the air around it, causing a strong shock wave that can cause injuries to the ear or even physical displacement.

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Name the muscular contractions that force the food downwards

Answers

Peristalsis is the muscle that forces food downwards.

Morris is having trouble sleeping, has lost his appetite, is too tired to go to work, and cannot concentrate on simple television shows. it is most likely that morris would be diagnosed with which disorder?

Answers

Depressive disorder

Depressive disorder is an illness which is characterized by persistent and intense feelings of sadness for long periods of time. It influences an individual’s mood and behavior as well as various physical functions such as appetite and sleep.This disorder sometimes makes an individual to lose interest in activities they once enjoyed and have trouble performing everyday activities. For the question given above, it is most likely that Morris would be diagnosed with depressive disorder.







What is the location of the sensory structures that translate things you see into nerve impulses?

A. On the retina
B. On the cornea
C. In the cochlea
D. In the olfactory bulb

Answers

Retina is the location of the sensory structures that translate things one sees into nerve impulses. It is a thin layer of tissue that lines the back of the inside part of the eye. It receives light that has been focused by the lens, then converts it into neural signals, and sends the signals to the brain for visual recognition. 

Flexor and extensor muscles work _______ to operate the joint.

Answers

Flexor and extensor muscles work antagonistically to operate the joint.

Flexor and extensor muscle work in the different direction. This will be called antagonist muscle because their force will cancel each other. It is important to have antagonist muscle because muscle could only shorten, thus could only move the body in one direction. Having two antagonist muscle will allow 2  moving direction

How can you determine if your cardiovascular system is becoming more fit?

Answers

To determine if the cardiovascular system is becoming more fit as a result of fitness program, the resting heart rate should be going slower. Cardiovascular system is the system of the body that allows the circulation and transportation of nutrients, oxygen, hormones, carbon dioxide through out the body. It includes the blood vessels, the lungs, the heart and the blood.

John went to a picnic. he took home some leftover chicken and rice, heated it on the stove, ate it, and got sick two hours later. john thought the heating made his food safe because it would have killed any bacteria present. he didn't know that __________ produces a heat-stable toxin. view available hint(s)

Answers

Staphylococcus aureus

Staphylococcus aureus is bacterial that causes staphylococcal food poisoning which is one of the most common food-borne diseases. This food poisoning is caused by the ingestion of foods contaminated with enterotoxins produced by staphylococcus aureus. The enterotoxins produced by this organism are able to survive in stomach acids, drying and extreme temperature which makes them heat stable.






In an aquatic habitat, an example of organisms from the pioneer community would be - f water reeds g algae h water lilies j grass

Answers

Answer: Algae

Explanation: Just took the test

A student is asked to draw a food web in which the same organism is a primary consumer as well as a secondary consumer. how should the organism be represented in the food web?
a. the organism must have an arrow pointing from it to a tertiary consumer and another arrow pointed from it to a decomposer.
b. the organism must have an arrow pointing from it to a secondary consumer and another arrow pointing to it from the top predator.
c. the organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer.
d. the organism must have an arrow pointing from it to primary consumer and another arrow pointing away from it to a decomposer.

Answers

The correct anwser  is C.

Answer:

C. The organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer.

Explanation:

Producers release carbon dioxide into the atmosphere during the process of photosynthesis. select one:
a. True
b. False

Answers

False they release oxygen 

Science Help >~>~>~


A volcanic eruption adds carbon dioxide to the air. This is an example of interactions between the


1)

atmosphere and geosphere


2)

hydrosphere and geosphere


3)

hydrosphere and biosphere


4)

geosphere and biosphere

Answers

The interaction of a volcanic eruption spouting carbon dioxide to the air is an interaction between the atmosphere and the geosphere. A volcanic eruption is an event that occurs in the geosphere. Air is part of the atmosphere. If you look at it logically the only answer would be 1.

What does the presence of similar genes in very dissimilar organisms imply? a the organisms do not share a common ancestor. b the genes became identical through mutation. c they must be in the same family. d the organisms share a common ancestor?

Answers

d) the organisms share a common ancestor

Normal fruit flies have brownish-yellow bodies, and this body color is dominant. a mutation in the gene for body color can produce flies with an ebony body color. a homozygous normal fruit fly (e
e. is crossed with a homozygous ebony fruit fly (ee). what is the predicted outcome of this genetic cross

Answers

Crossing a homozygous normal brownish-yellow body fruit fly (ee) with a homozygous ebony body fruit fly (ee) will result in all offspring being heterozygous (Ee) with a brownish-yellow body phenotype.


In the genetic cross between a homozygous normal fruit fly with a brownish-yellow body (ee) and a homozygous ebony fruit fly (ee), all offspring will inherit one allele for body color from each parent. Since the brownish-yellow body color is dominant, all the F1 generation will display the dominant phenotype. The predicted genotypic outcome will be 100% heterozygous (Ee) with the ebony body color being masked. Therefore, the phenotypic outcome will be 100% brownish-yellow fruit flies, as the ebony body color is recessive and will not be expressed in the presence of the dominant allele.

A 20-year-old male is hospitalized with a 4-day history of cough and a temperature of 41°c. chest sounds are dull to percussion. a sputum gram stain is non-diagnostic. a blood culture is positive for gram-positive cocci in pairs. the recommended treatment is with __________.

Answers

Penicillin
***********

Species are disappearing almost a thousand times faster than they are forming. What is the main cause?

Answers

The answer is Human Impact 

Human Impact       is the answer

"tobacco smoke is responsible for what percentage of lung cancer deaths?"

Answers

It has been estimated that active tobacco smoking causes close to 90% of lung cancer cases and is the cause of 87% of lung cancer deaths.

One of the reasons for the success of the smallpox eradication campaign was that
a. smallpox viruses were used in the vaccine.
b. smallpox was not a transmissible disease.
c. smallpox occurred only in humans.
d. smallpox occurred only in south america.
e. smallpox could be treated with antibiotics.

Answers

One of the reasons for the success of the smallpox eradication campaign was that small pox only occurred in humans. Smallpox is an extremely contagious and deadly virus for which there is no known cure. it is caused by two variants, Variola major and Variola minor. it is a disease of the past that was eliminated by worldwide vaccination. 

Select the correct definition about tissue grafts.
a. allografts are between different species.
b. xenografts are between individuals of the same species.
c. isografts are between identical twins.
d. autografts are between two genetically identical individuals.

Answers

The correct answer is c. isografts are between identical twins.
Isograft is is a graft (transplantation tissue) between two individuals who are genetically identical (monozygotic twins). This is usually very successful transplantation between such two individuals (transplant rejection never occurs). This is because genetically identical individuals have the same major histocompatibility complex, which is usually responsible for the rejection by the adaptive immune system.
Final answer:

The different types of tissue grafts are allografts, xenografts, isografts, and autografts.

Explanation:

The correct definition about tissue grafts is:

Allografts are tissue grafts between individuals of the same species.Xenografts are tissue grafts between different species.Isografts are tissue grafts between genetically identical individuals, such as identical twins.Autografts are tissue grafts taken from one part of an individual's body and transferred to another part of the same individual.

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Definition: this is the process of organisms adapting to their environments over time.

Answers

Adaptation through natural selection
The answer is indeed natural selection.

This is the evolutionary process by which beneficial adaptations increase over time in a population due to increased survival and reproductive success of individuals with those adaptations.

Hope this helps! I'm happy to help with any other questions you might have :)

how can the processes of parasitism and predation be different if they both harm organsims?

Answers

The similarity between predators and parasites is that both acquire energy by taking that energy from other organisms. It positively affects one organism (the predator or parasite) while negatively affects the other organism (the prey or host organism). But, the main difference is that predators tend to kill their prey while parasites don’t. Parasites only take resources from their host.

Which of these organizations acknowledges that the threat to wildlife and biodiversity is greater today than ever before ?
A. Convention on biological diversity
B. The fans at convention
C. World trade organization
D. Convention on international trade in endangered species

Answers

The organization that acknowledges that the threat to wildlife and biodiversity is greater today than ever before is the Convention on Biological Diversity which is in option A.

what is Convention on Biological Diversity ?

The Convention on Biological Diversity (CBD) acknowledges that the threat to wildlife and biodiversity is greater today than ever before. The CBD is an international treaty signed by 196 countries, which aims to conserve biodiversity, promote sustainable use of its components, and share benefits from genetic resources in a fair and equitable way. The CBD recognizes that human activities such as deforestation, climate change, pollution, and overfishing have a significant impact on the natural world and threaten the survival of many species

Hence, the organization that acknowledges that the threat to wildlife and biodiversity is greater today than ever before is the Convention on Biological Diversity which is in option A

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an energy pyramid illustrates that energy is a form of _____is lost to the surrounding as it is passed from one organism to the next???

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An energy pyramid illustrates that energy in the form of heat is lost to the surrounding as it is passed from one organism to the next. In an energy pyramid energy is passed from one trophic level to the next, however, only ten percent of the energy in a given trophic level is passed to the next, as most of the energy is lost inform of heat to the surroundings. 

The most common visual problems are the results of errors of refraction. examples of refraction errors that affect central visual acuity include ______________.

Answers

Myopia, Hyperopia, Astigmatism

The most common visual problems that result from errors of refraction and affect central visual acuity include:

Myopia (Nearsightedness)

Hyperopia (Farsightedness)

Presbyopia

Astigmatism

What are the errors of refraction

Myopia (Nearsightedness): This is when you can see near objects clearly, but distant objects are blurry. It's often caused by an elongated eye shape, which causes light to focus in front of the retina instead of directly on it.

Hyperopia (Farsightedness): This is the opposite of myopia. You can see distant objects clearly, but near objects are blurry. It's often caused by a shortened eye shape, which causes light to focus behind the retina.

Astigmatism: This is when the cornea (the front surface of the eye) or lens has an irregular shape, causing light to be focused unevenly on the retina. This can result in blurred vision at all distances.

Presbyopia: This is an age-related condition that affects the eye's ability to focus on near objects. It occurs as the lens of the eye becomes less flexible with age.

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The dorsal fin of a shark is _____ to the dorsal fin of a dolphin. this anatomical feature is the result of convergent evolution (i.e., adaptation to similar environmental pressures).

Answers

Answer:  "analogous" .
___________________________________________________

Todd was startled when the door slammed shut. what part of the brainstem is responsible? todd was startled when the door slammed shut. what part of the brainstem is responsible? thalamus medulla midbrain pons

Answers

Todd was startled when the door slammed shut, the part of the brainstem that is responsible is the midbrain. The midbrain consists of the tectum and tegmentum, while the fore brain consists of the cerebrum, thalamus, and hypothalamus, and the hindbrain is made of the cerebellum, pons, and medulla. The midbrain serves important functions in motor movement, particularly movements of the eye, and in auditory and visual processing. 

The part of the brainstem responsible for Todd being startled when the door slammed shut is the midbrain.

When an individual is startled by a sudden and loud noise, such as a door slamming, the midbrain plays a crucial role in the startle reflex. The midbrain is part of the brainstem and is involved in auditory and visual reflexes. It contains the reticular activating system (RAS), which is responsible for regulating arousal and alertness. The RAS also plays a role in the startle reflex by activating the amygdala, which processes emotions, and the hypothalamus, which controls the fight-or-flight response.

The other options listed have different functions:

- The thalamus, often considered part of the limbic system, serves as a relay station for sensory and motor signals to the cerebral cortex, but it is not part of the brainstem.

- The medulla is responsible for autonomic control of vital functions such as heart rate, breathing, and blood pressure.

- The pons is involved in sleep regulation and the transmission of sensory information, but it is not the primary region responsible for the startle reflex.

Therefore, the midbrain is the part of the brainstem most directly involved in the startle reflex when Todd was startled by the door slamming shut.

Which type of vaccines triggers the recipient's immune system to produce antitoxins?

Answers

The answer would be Toxoid vaccines

Toxoid is a vaccine that made from weakened toxins so it won't damage the cells like the original toxin do. But it still has the ability to induce the immunologic cell's response so they will produce antitoxin that could neutralize the original toxin. The example of this vaccine would be tetanus and diphtheria toxoid.
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