Why is the sickle cell allele still common in tropical regions?

Answers

Answer 1
Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.

Related Questions

Lack of which factor would be most likely to turn an alien species into an invasive species?


mates

suitable food

suitable habitat

predators

Answers

Answer:

predators

Explanation:

The correct answer is predators. An alien species that finds plenty of food and suitable habitat in its new home is usually able to find mates and reproduce well. But the competing species may become endangered or even extinct, because the alien (now invasive) species has no natural predators in the new environment, and its population can therefore grow without limits.

Answer: predators

Explanation:

if you had to choose between the phrase "natural selection gives organisms what they need" vs. "natural selection chooses traits that are most successful", which one would you choose? defend your answer.

Answers

Answer:

Natural selection gives organisms what they need

Explanation:

The species constantly evolve because of the changes around them. Natural selection gives organisms what they NEED in order to survive. "Natural selection produces organisms perfectly suited to their environments".

Species that continually evolve because of changes around them where natural selection gives organisms what they need to survive. "Natural selection makes organisms perfectly adapted to their environment".

What is Natural Selection?

Natural selection is defined as the differential survival and reproduction of individuals due to differences in phenotype which is a major mechanism of evolution, a change in the genetic properties of populations over generations.

It is the process through which populations of living organisms adapt and change where individuals in a population are inherently variable, meaning they all differ in some way. This variation means that some individuals have better adaptations to the environment than others.

Thus, species that continually evolve because of changes around them where natural selection gives organisms what they need to survive. "Natural selection makes organisms perfectly adapted to their environment".

Learn more about Natural selection, here:

https://brainly.com/question/2725702

#SPJ2

Can I get help with the cell structure and major cell types

Answers

Answer:

Explanation:

i can answer all that

what do plants produce using nitrogen?

Answers

Answer:  Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins.

Explanation:

What are the special attack enzymes bacteria produce to fend off viral attacks? *

Answers

Answer:

Many bacteria have a molecular immune system which allows these microbes to capture and retain pieces of viral DNA that they have encountered in the past, in order to recognize and destroy it when it shows up again.

Explanation:

•Who developed DNA fingerprinting?

•explain individual evidence and trace evidence according to DNA

•explain the use of a DNA probe

Answers

Answer:

Alec jefferis developed DNA fingerprinting.

at the cellular level, what caused Sally's cancer

Answers

Answer:

Uncontrollable cell division.

Explanation:

Cancer is a disease which is caused when cells division is uncontrollable and spread into surrounding cells and tissues. Mutations in genes is also responsible for the cause of cancer because this mutation accelerate the rate of cell division or inhibiting normal controls on the system, such as programmed cell death. When the mass of cancerous cells grows with the passage of time, it turn into a tumor.

The image below depicts a bowling ball traveling down the lane and striking pins, knocking them down. Identify at least two forces acting on the bowling ball.


1. gravity

2. friction

3. air resistance
(also called ‘drag’)

4. density




Answers

Friction and air resistance

why do food scientists analyse the dna from meat products

Answers

shhdjdjdnxhdndndnfnfncncjjdjsje

Can you help me? Please

Answers

1. pH (fun fact, it means potention of hydrogen )

2. H+

3. hydronium ion

4. 7

5. 7

6. OH-

7. acidic

8. alkaline

Photosynthesis cycles matter and energy in many envoronments. Explain how chemosynthesis cycles matter and energy in extreme environments. Explain your answer in 1-2 sentences.​

Answers

Answer:

They have metabolism that evolves on earth, lading to development of cellular respiration and photosynthesis later.

Explanation:

Chemosynthesis is a biological transformation of carbon molecules and nutrients into organic matter using the oxidation of inorganic compounds. Thus may support life on the surface of Mars and Jupiter.

Answer:

Chemosynthesis uses chemical energy instead of light energy to convert carbon or methane into organic matter. Chemosynthesis cycles matter, by passing matter and energy from one organism to aother when organisms are consumed.

Explanation:

I got 2/2 on this essay question :) prob just mix up what I said, so you're not flagged for plagirism.

Which leaf would be in a cold and snowy climate?
Venus Fly Trap
Cactus
Sunflower
Wintergreen boxwood

Answers

Answer Wintergreen Boxwood

Explanation:

These are from cold snowy climates

im not sure but I have Wintergreen boxwood in my backyard and its snows all the time and its still very much alive so ye

sorry if i got this one wrong (i do know cactus, and sunflower usually need lots of heat to survive so if that helps)

No question, just answers

What is the difference between a detritivore and a decomposer?

While detritivores feed on dead organic matter, decomposers actually break down dead or decaying organisms.

What is the main difference between food chains and food webs?

Food webs are more complex than simple food chains.

Taj incorrectly states that autotrophs are also known as consumers that need to feed on other organisms, including plants and animals, to gain energy. Which of the following best describes consumers that feed on other organisms such as plants and animals for energy?

heterotrophs

Which of the following is the first trophic level in every ecosystem?

autotroph

What is the relationship between matter and energy in an ecosystem?

Matter and energy are cycled through the ecosystem.

Answers

Well let me add on

A food chain shows the feeding between different trophies levels and a food web shows feeding in an interrelated food chain.

Which of the folllowing is true about the efficiency of the energy conversions in terms of the overall energy available to human shown in these diagrams

Answers

Answer:

Showing results for Which of the following is true about the efficiency of the energy conversions in terms of the overall energy available to human shown in these diagrams

Search instead for Which of the folllowing is true about the efficiency of the energy conversions in terms of the overall energy available to human shown in these

Lactase is an enzyme produced in the small intestine helps digest lactose. What basic building blocks are used by the body to make lactase in the intestine) Answer choices are below

Answers

Sugars is thee right answer

Which statement correctly compares electric charge with electric current?

Answers

Answer:

voltage causes electric charges to move from higher to lower potential.

Explanation:

why blood flow in a leg vein is slow when there is lack of movement?​

Answers

The guy in front of me is correct

What is the shortest day of 2021? And What is the Longest Day 2021?

Answers

Answer:

June 21st is the longest day of the year December 21st is the shortest

Explanation:

Answer:

June 21st and December 21st

Explanation:

Which 4 characteristics would farmers want bred in to the modern pig? Will give brainliest!

Answers

Answer:

Selective breeding means herd improvement, on things such as milking ability, mothering ability, carcass quality, forage utilization efficiency, stability, birth weights, weaning weights, etc and they taste better.

Explanation:

What role does air pressure play in weather conditions?
a
Its force determines the strength of the wind.
It creates downdrafts that blow from the shore.
It is the primary cause of the Trade Winds.
It determines how high or low the tide is.
С

Answers

It’s the first one. “It’s force determines..”

In a lake ecosystem, the atmospheric sciences component of environmental science might deal with _______. A. air pollution B. study of lake organisms C. study of chemicals dissolved in the lake D. study of the impact of surface runoff

Answers

Answer:

C. study of chemicals dissolved in the lake. I think that's the answer

Explanation:

Scientists recently discovered that rocks collected from the Franklin Mountains in West Texas and rocks collected

from mountains in eastern Antarctica were exactly the same age. Further research showed that the rocks were

chemically and geologically the same and came from the same magma source. This discovery provides evidence

of

А

coastal erosion

B

plate tectonics

с

ocean currents

D

glacial melting

Answers

Answer:

Plate tectonics

Explanation:

Plate tectonics explains the features and movement of earth surface in the present and the past.

These plates are pieces of cracked shell that rest on the hot , molten rock of earth's mantle. The heat from the radioactive processes within the planet's inferior causes the plates to move, sometimes towards and sometimes away from each other.

These rocks collected were as a result of plate tectonics which drifted away.

DNA is directly involved in the process of transcription?

Answers

Answer:

yes

Explanation:

the answer is yes. if the question is yes or no...

In fact, he thought that if a species changed enough, it might evolve into a new species.

Answers

Answer:

More context

Explanation:

Therefore, he called this type of selection natural selection. Darwin knew artificial selection could change domestic species over time. ... In fact, he thought that if a species changed enough, it might evolve into a new species.

IF YOU HAVE DONE ODSSEYWARE PLEASE HELP AND GIVE THE THE ANSWER

Choose all the answers that apply.
Mudslides can be caused by _____.

earthquakes

volcanoes

tsunamis

weathering

Answers

Earthquakes and weathering

Does anyone know how to do this???

Answers

I’m sorry but I have no idea, good luck finding help!

Population

Time (Years)

What has happened to the population after year 10?

©

The population has reached carrying capacity

The population is declining due to a new predator

The population is increasing because more food became available

The population is remaining constant because the and death rate are equal

Answers

Answer:

A. The population has reached carrying capacity.

Explanation:

I majored in Biology

Which of the following statements is true?
Only somatic mutations are important to evolution because they can be inherited.
Acquired mutations are passed down from parent to offspring.
O Hereditary mutations are caused by external factors, such as radiation.
O Mutations are the most fundamental way to add new genes to a gene pool.

Answers

Answer: A,B, and C.) Only somatic mutations are important to evolution because they can be inherited. Acquired mutations are passed down from parent to offspring. Hereditary mutations are caused by external factors, such as radiation.

Explanation:

The true statement is: Mutations are the most fundamental way to add new genes to a gene pool.

A mutation is any alteration in the genetic material (i.e. nucleotide sequence) of the genome of an organism.  

Mutations can be caused by both external (e.g., UV light) and endogenous (e.g., oxidative DNA damage) factors.

Mutation can be divided into somatic (body) cells and germline (gamete) cells. Only germline mutations can be inherited and pass from parents to offspring.

Acquired mutations are genetic alterations that are not present in the zygote, but are acquired sometime later in life. This type of mutation is involved in the development of cancer.

Mutations are the raw material on which natural selection operates, thus being the most important cause of evolutionary novelty.

In conclusion, mutations represent the most important source of genetic variability and a fundamental way to add new genes to a gene pool.  

Learn more in:

https://brainly.com/question/1386237?referrer=searchResults

the process that are responsible for growth development and other vital functions​

Answers

Answer:

For one to form, there needs to be warm ocean water and moist, humid air in the region. When humid air is flowing upward at a zone of low pressure over warm ocean water, the water is released from the air as creating the clouds of the storm. As it rises, the air in a hurricane rotates.

Explanation:

I hope it's help


Which hypothesis helps to explain why all organisms share the same genetic code?

Answers

RNA , RNA molecules may have been able to self-replicate without the help of other molecules. If early RNA molecules were able to copy themselves to build new RNA molecules, this helps to explain why all organisms share the same genetic code.
Other Questions
Round the fraction to the nearest whole number. 3 1/2 If two possitive fractions are less than 1, why is their product less than 1 Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column.Property P: A small sample of X is dissolved in water. Drops of another solution, containing dissolved sodium hydroxide, are slowly added, and a pH indicator is used to determine when the sodium hydroxide has completely reacted with X. From the amount of sodium hydroxide needed, the value of P may be calculated.Property D: A sample of X is carefully weighed and put inside a vented flask. Water is added to the flask until it just covers the sample, and the volume of sample and water is recorded. Then the sample is removed and the volume of water alone recorded. From the mass of the sample and the difference in volumes, the value of R may be calculated.Property V: Sample of X is melted and put into a reservoir from which a very thin tube leads down. The rate at which X flows out of the tube is measured, and from this rate the value of V may be calculated. what is two examples of software and hardware? What are CDs in economics? which of the following statements about extinction is true?a) extinction is the ultimate fate of all speciesb) extinction can occur in small areas c) extinction can be caused by the introduction of exotic speciesd) all of the above What is 0.0000000053 in standard form? 7. By about how much did the concentration of CO2 in the atmosphere changebetween 1880 and 2020? * In which part of a project assignment should you ask the following question?What are the requirements of this project?taskpurposeaudienceargument What message was Washington trying to convey when he warned against the destructive spirit of political parties?Please help! Tysm! I need help quick because its timed. Pls help!!!!!!!!!!!!!!!!!!!! A board is 29ft long. The second piece is 4 times longer than the first. The third piece is 3 times longer than the second. What is the length of all pieces. As the human population grows, the size of cities increases. As cities grow, more land must be cleared to make way for homes, businesses, and roads. Which two events would be likely effects of replacing a forested area with an urban area? A. More air pollution because there are fewer trees to take in carbon dioxide B. Less erosion of soil as plants covering the ground are added to gardens C. Fewer birds and other wildlife because they have fewer places to live D. More trees because of increased solar energy in the area 1. Many nonmetals are weak and2. The property of an element to be beaten into sheets isknown as3. The total space occupied by an object is5.is a gas and is an f(n) = 3(n+ 1). Find f(-2) Montresor and Fortunato are wearing costumes because it is carnival time.One reason Montresor is wearing a costume is to be sure no one recognizes him when he is walking back to his house with Fortunato.Fortunato was a competitive person because he got jealous when he thought Luchesi was going to taste the Amontillado.Montresor leads Fortunato down into the catacombs where many people were buried.Montresor and Fortunato were down in the catacombs until midnight.Montresor was upset because Fortunato had seriously offended him and wanted revenge.No one ever found Fortunato, who Montresor buried alive down in the catacombs.Montresor kept giving Fortunato wine because he knew he could not resist it and wanted Fortunato to keep following him. please help me !!! easy question and ill give brainliest Olivia completed a high dive from a platform at a recent competition.The graph below shows her distance from the pool, in meters, as afunction of time, in seconds. Write the first 3 terms for the given formulaf(n) = 2n + 10 for starting with n = 1