answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leona [35]
2 years ago
10

Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa? When an area is ma

laria free, the HbS allele frequency is between 0 and 2.02. When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04. When an area is malaria free, the HbS allele frequency is between 12.64 and 18.18. When an area is holoendemic, the HbS allele frequency is between 0 and 0.51.
Biology
2 answers:
cricket20 [7]2 years ago
8 0

Answer:

The answer is; When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04

Holoendemicity means that almost all individuals in a population are infected by a disease or pathogen (in this case Malaria) at one point in their lives. HbS allele is the sickle cell hemoglobin allele that provides immunity to malaria. Therefore, natural selection will favor the population with HbS allele in a Malaria holoendemic region. The HbS allele frequency in this population is expected to be high.

Guest
1 year ago
thanks bro
NNADVOKAT [17]2 years ago
5 0
<h3><u>Answer;</u></h3>

When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04.

<h3><u>Explanation;</u></h3>
  • <em><u>HbS allele is the sickle cell hemoglobin allele that provides immunity to malaria. This is because people with the sickle cell allele have a selective advantage in areas where there is a high incidence of malaria.</u></em>
  • Therefore, natural selection will favor the population with HbS allele in a Malaria holoendemic (most individuals are infected) region. The HbS allele frequency in this population is expected to be high.
  • After malaria is cured, the frequency of the HbS allele should decrease in regions with a lot of mosquitoes because having one copy of the HbS allele will no longer be advantageous in these regions.
You might be interested in
Which feature is not the result of a glacier carving out rock as it moves
Kryger [21]
<span> The feature which is not the result of a glacier carving out rock as it moves is

</span><span>A. Terminal Moraine
</span><span>
The feature  which is the result of a glacier carving out rock as it moves is 
</span>A. Roche Moutonnees

Explanation
:
 Rôche moutonnée (or sheepback) could be a rock formation created by the passing of an ice mass. The passage of ice mass ice underlying bedrock usually leads to uneven erosional forms as a result of abrasion on the "stoss" (upstream) facet<span> of the rock and plucking on the "lee".
</span>
A terminal ground<span> </span>conjointly referred to as finish ground<span>, </span>could be a form of ground<span> that forms at the snout (edge) of an </span>ice mass<span>, marking its </span>most<span> advanced. At </span>now<span>, </span>rubble<span> that has accumulated by plucking and abrasion.</span>
6 0
2 years ago
Read 2 more answers
If China has a population of 1,355,935,022 people and an area of 3,705,405 mi2028-02-04-03-00_files/i0160000.jpg, what is the po
xz_007 [3.2K]
To answer this question, we divide the number of people by the area.
# of people = 1,355,935,022
divided by
Area           = <span>3,705,405 square miles 

= 365.93 people/ square mile</span>
3 0
2 years ago
Read 2 more answers
The ability of one or more organisms in a population to tolerate a chemical such as a pesticide or antibiotic designed to kill i
Aleksandr [31]

Answer:

The correct answer is- Resistance

Explanation:

The ability of any organism in a population to tolerate a chemical like insecticide, pesticide or antibiotic which is designed to kill it or slow its reproduction is called resistance.

For example, the antibiotic resistance is seen in some bacteria like MRSA(Methicillin-resistant staphylococcus aureus). They gain this resistance because they have some variant traits in their genome which provide them resistance against these chemicals.  

These individual are selected through natural selection when the environmental condition changes and become adverse. So the correct answer is resistance.

5 0
2 years ago
There are six people in the Fisher family. Olivia and Marcus are the parents. They have four children: Violet, Nathan, Jonas, an
Trava [24]
<span> Wow, this is a big question, but here goes. Freckles q: 1) Since freckles is the dominant phenotype, this means that Olivia must have the recessive phenotype, which is only given by the genotype ff. FF and Ff would both give freckles because, again, freckles is dominant. So any genotype with F_ would give freckles. 2)Same answer as #1. 3) Since they only have f alleles to pass on, both the dad and the mom will pass on one f each to 100% of their children. So all will have genotype ff and no freckles.
Hairline q: Since the parents are heterozygous, this means that their genotype has one of each allele to give Hh. (Even though you said they are quadruplets, I'm going to assume they are fraternal (different DNA) b/c otherwise they'd always have the same genotype if they are identical). 1) Okay, so when you do the Punnett square for Hh x Hh, you'll get 1HH:2Hh:1hh. Since widow's peak is dominant, any genotype with H_ gives the widow's peak. So, there are 3 options from the Punnett square, so you'll have 3 of the kids with widow's peak. Theres a 3/4 chance that a child will have widow's peak from these parents. 2) Since straight hairline is recessive, you need hh to get this phenotype and there is only one option. So, there will only be one child with the straight hairline. (1/4 chance). 3) Homozygous dominant means that you have two of the dominant allele, so HH. Since there is only 1 option, there is only one child with this genotype.
Tongue q: Since rolling the tongue is a dominant trait and the parents both can't roll their tongues, they must have a homozygous recessive genotype for this to happen (remember in dominance, any genotype with a dominant allele will give the dominant phenotype), so they have tt. 1) Since again they can only pass on t alleles, the kids will all have tt, so no one can roll their tongues. 2) None of them are hybrids because there was no variety in the genotypes or anything. Both parents had tt, so they were same in genotype. 3) She will have tt because of the above stated reasons.
Dimples q: Since all four kids have dimples, the dominant phenotype, they must all have the genotype D_ (either Dd or DD). 1) Since Marcus is a hybrid, this means that he had parents that were DD x dd to give him the genotype Dd. Since he has a recessive allele d in his genotype, Olivia must have all dominant alleles to make sure that each child has at least one dominant D. So, she must have the genotype DD. 2) Since she is DD, the dominant alleles will make her have dimples.
Earlobe q: 1) Since the parents are EE both, a cross of EE x EE will give EE genotype children. So, all children have EE, this means they all have free earlobes. So the ratio is 100% free to 0% attached earlobes. 2)Homozygous means they have two of the same alleles. Since all of them have EE, 100% of them are homozygous.
PTC q: Marcus has genotype bb and Olivia has genotype Bb because she is heterozygous. 1) The cross of bb x Bb gives 1Bb:1bb, So, 1/2 can taste the paper, so 50% can taste. 2) Since Violet can't taste the paper, she must be recessive and have the genotype bb. Since both of the boys can taste, they must have the genotypes Bb. Since 1/2 is already Bb, Claudia must be bb to help create the 50% that can't taste in the kids. 3)So, 2 people out of the family can taste the paper. Even though Olivia has Bb and should be able to taste, she can't. So, only Jonas and Nathan can taste the paper.
Pheww... done.. Hope this helps! :)<span>
</span></span>
7 0
2 years ago
Read 2 more answers
Pests have always been a nuisance for farmers. The use of pesticides dramatically improved the success of crops; however, it has
BARSIC [14]
It is like when you take a medicine you don't need, it becomes useless when you need it because your body can fight it off. So, I would have to say that the pesticides have been used on the bugs so much that they can finally fight it off. I really hoped I helped :D
6 0
2 years ago
Read 2 more answers
Other questions:
  • Which of the following best describes what happens to atmospheric carbon as it moves through the carbon cycle ?
    15·1 answer
  • Which organs or tissues prefer to use ketone bodies such as acetoacetate as a fuel energy source instead of glucose?
    8·1 answer
  • Bailey leads a very stressful and busy life. She often eats fast food meals that are low in vitamins and fiber. Lately, she has
    9·2 answers
  • An elephant has 56 chromosomes. Which statement about a zygote of an elephant is true? A. The zygote has 28 chromosomes, mostly
    10·1 answer
  • Juan picks up a steel utensil and immediately drops it because it’s extremely hot. How does the reflex arc work to protect Juan
    12·2 answers
  • Your roommate, who has not studied climate, says, "I thought the greenhouse effect was a bad thing. Isn't it what's causing glob
    5·1 answer
  • Theoretical and experimental measurements show that in many cases, the contributions of ionic and hydrogen-bonding interactions
    15·2 answers
  • With the endosymbiotic hypothesis in mind, what structure within modern-day chloroplasts is likely derived from the cytoplasm of
    9·1 answer
  • Unit Test Which title best fits Rahma's notes? Rahma took these notes on a process involving the movement of molecules, but she
    14·3 answers
  • What makes carbohydrates, proteins, and nucleic acids different​
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!