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Elena L [17]
3 years ago
10

In the United States, the parasite that causes malaria is not present, but it is present in African-Americans whose ancestors we

re from equatorial Africa. What should be happening to the sickle-cell allele in the United States, and what should be happening to it in equatorial Africa?
Biology
1 answer:
slava [35]3 years ago
5 0

Answer: DIRECTIONAL SELECTION; STABILIZING SELECTION.

Explanation: In the United States of America the parasite that causes Malaria is not present,the parasite that causes Malaria are known to be a protozoa of the Plasmodium specie(Plasmodium: P. falciparum, P. malariae, P. ovale and P. vivax.).

DIRECTIONAL SELECTION is also known as positive selection where an advantageous allele increases as a consequence of differences in survival rate and reproduction among different phenotype Population.

STABILISING SELECTION is a type of natural selection in which a trait tend to remain stable,no one trait is felt more.

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Identify each event as the result of mechanical weathering or chemical weathering.
kow [346]

<h3><u>The following events are identified as chemical weathering:</u></h3>
  • The minerals in a marble statue react with water to form acids and pores in the structure.
  • The rocks in a region are streaked orange after being exposed to repeated rains.

<em><u>Reason: </u></em>

When the weathering process occurs due to <em>chemical reaction</em>, then it is considered as chemical weathering.

In <em>the first case</em>, minerals of marble statue are <em>reacting</em> with water to cause weathering. In the <em>second case</em>, due to the <em>acidificaion reaction</em>, the change of the color has happened after exposure to the repeated rains.

<h3><u>The following events are identified as Mechanical weathering:</u></h3>
  • A piece of rock crumbles after being constantly thrashed by strong waves.
  • Industrial runoff forms cracks in a rocky structure in its path.

<em><u>Reason:</u></em>

When the rock is broken into simple pieces <em>without any chemical reaction </em>it is considered as mechanical weathering.

In the <em>first cause</em>, due to the <em>abrasion</em> caused by the strong waves, weathering has happened, in the <em>second case</em> industrial run off may be of varying temperature and thus may cause <em>heating or cooling</em> of the rock and causes weathering.

8 0
3 years ago
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Environmental science addresses recycling strategy so we utilize our natural resources efficiently. It also provides us with knowledge on how to lead an eco-friendly lifestyle
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What are the abiotic factors that could affect a population? ​
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Abiotic factors are the non-living factors in an environment such as temperature, light, water, and nutrients.
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A 3-hectare lake in the american midwest suddenly has succumbed to an algal bloom. what is the likely cause of eutrophication in
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The correct answer is a nutrient runoff.  

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We have looked at the cloning experiments involved in producing Snuppy. Describe the specific technique that was used and how th
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Answer:

Cloning may be defined as the process by which the genetically identified individual of the organism can be created artifically or naturally. Aseual reproduction results in the formation of clone.

The microsatellite analysis is used to prove that snuppy is a clone. Microsatellites are the highly variable DNA sequences repeats that has variable loci and considered at population level. The two alleles are possible for the one microsatellite locus. After comparing the alleles it has been found that snuppy has exactly the same genetic material as the surrogate mother, afghan. This completely determines that snuppy is a clone of afgan.

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