A deleterious recessive allele is one that can be harmful when it is found in its homgous condition, resulting in a poorly fit phenotype. An example of this is the allelefor sickle cell, which results in the condition known as sickle cell anemia when both recessive alleles are inherited. owever, in regions of Afriche proportion of the sickle cell allele is igher than expected, with as much as 15% of the alleles in the population being the recessive, deleteriou rsion. In the African population, there is also a high prevalence of malaria, a disease caused by the parasitic infestation of a plasmodium protozoan in the blood of humans. The recessive allele for sickle cell has been maintained over many generations. Evaluate the graph above and select the claim that supports the high frequency of the recessive allele in these African populations.
A)There is a selective advantage to the aa genotype, as the presence of sickle cell provides a greater fitness in an environment where malaria is common.
B)There is a selective pressure against the aa genotype, but the presence of malaria induces new mutations which generates more alleles within the population.
C)There is directional selection towards the Aa genotype, since aa is often a lethal condition. Non-random mating tends to maintain the recessive allele in the population.
D)There is a selective advantage to the heterozygous (Aa) condition as there is selective pressure against both the AA and aa genotypes. This maintains the recessive allele in the population.

Answer:

D) There is a selective advantage to the heterozygous (Aa) condition as there is selective pressure against both the AA and aa genotypes. This maintains the recessive allele in the population.

Explanation:

Since the AA condition is more likely to be affected by malaria and the aa condition is more likely to not survive the sickle cell condition, the heterozygote here has the advantage.

The high frequency should be considered the D) There is a selective advantage to the heterozygous (Aa) condition.

Since the AA condition should be impacted by the malaria and the aa condition should not able to survive the cell condition i.e. sickle.

At the same time, the heterozygote has the advantage.

Also, there is the selective pressure that oppose to the AA and aa genetypes.

Hence, the option d is correct.

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For aerobic respiration, a variety of substances must be in a state of influx across the inner membrane. Assuming a brain cell in which glucose is the sole energy source, indicate for each of the following substances whether you would expect a net flux across the membrane and if so, how many molecules will move in which direction per molecule of glucose catabolized.

- electrons
-pyruvate
-oxygen
-ATP
-ADP
-Acetyl CoA
-Glyceral-3-phosphate
-NADH
-FADH2
-Oxaloacetate
-Water
-Protons

Which of the following cellular components would be most sensitive to phospholipases?

The lipid bilayer
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A. terracing
B. humus
C. sediments
D. abrasion

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a. favorable light and temperatures

b. inadequate food supply

c. inability to complete

d. inability to migrate, hide or defend

e. inability to resist disease

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During what phase of meiosis does non-sister chromatids align at the equator?

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A.single-celled, dry

B.multi-celled, moist

multi-celled, dry

single-celled, moist

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b) Explain why a leaf cannot be tested for starch by adding iodine solution directly.​

A sound wave that occurs at a quick rate and has a high frequency would produce
A
a loud sound.

B
a low-pitched sound.

C
a high-pitched sound.

D
a soft sound.

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If a DNA strand contains 12% thymine, it also contains ____

a. 12% A, 38% G, 38% C
b. 12% A, 12% G, 38% C
c. 12% A, 12% G, 12% C
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Proteins are a type of biomolecule with a wide variety of functions. Which statement is correct about the digestive system and proteins?

Question 1 options:

Enzymes in your saliva start breaking down the carbohydrates in food


Ready to use energy is released as the protein is broken down


The large intestine absorbs proteins for use in cells.


The liver manufactures bile salts that help break down fats in proteins

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describe the structure of​

Which of these elements is likely to be found in an organic compound?

A. helium
B. hydrogen
C. mercury
D. tin

Question 13 of 35
Which option describes the direction of thermal energy transfer in Earth's
oceans?
A. From the poles to the equator
B. From cool areas to warm areas
C. From the ocean floor to its surface water
D. From the equator to the poles
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In humans, normal color perception (N) dominates the expression of color blindness (n), and both of these genes are carried on the X chromosome (XN or Xn). A woman with normal color vision has a color-blind father. Her husband is also color-blind.

a. What is the genotype of the colorblind man? ____
b. What is the genotype of the woman? ______
c. What is the probability of her daughter to be colorblind? __________%
d. What is the probability of her sons to be colorblind? _________%

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a thick black cloth that forms a barrier to weeds and holds down erosion is called ?

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A 30-year-old male demonstrated a subtle onset of the following symptoms: dull facial expression; droopy eyelids; puffiness of the face and periorbital swelling; sparse, dry hair; dry, scaly skin; evidence of intellectual impairment; lethargy; a change of personality; bradycardia (60 b/min) low range of normal; a blood pressure of 90/70 low BP; anemia low iron – cant transport O through body very well(hematocrit 27); enlarged heart (upon radiological exam); constipation, and hypothermia. Plasma concentrations of total and free T4 and T3 follow:
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d. List several defects that could cause these symptoms.
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ON, and in motion
13N and in motion
0N and at rest
13N and at rest