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amm1812
3 years ago
13

describe how natural selection can sometimes lead to persistence of harmful or even lethal allele include exampple

Biology
1 answer:
balu736 [363]3 years ago
8 0

Answer:

<em>Look below.</em>

Explanation:

This question may have made it seem like natural selection is a harmful process -- be wary of this. To understand this, you have to note something known as heterozygote advantage. All this means is that the heterozygotes, the organism that expresses both the dominant and recessive alleles, rather than the homozygotes, organisms that express both dominant or both recessive alleles, have an advantage. An example is with sickle cell disease. People heterozygous for the sickle cell trait are more resistant to malaria for some reason, whereas the homozygotes are not. Because heterozygotes (which have a harmful allele and normal allele) have the advantage, natural selection selects for this trait and favors it. This leads to the "persistence of harmful or even lethal allele[s]." Again, just because the organism has a lethal allele isn't necessary always a bad thing. :)

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most people don't need to count every single micronutrient they eat. instead doctors recommend that they eat a well balanced die
Korvikt [17]

Answer:

The nutrition therapy goals for the individual with diabetes have evolved and have become more flexible and patient centered. The goals from the American Diabetes Association (ADA) 2019 include the following: (2)

1.

To promote and support healthful eating patterns, emphasizing a variety of nutrient dense foods in appropriate portion sizes in order to improve overall health and:

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Achieve and maintain body weight goals

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Attain individualized glycemic, blood pressure, and lipid goals

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Delay or prevent complications of diabetes

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To address individual nutrition needs based on personal and cultural preferences, health literacy and numeracy, access to healthful food choices, willingness and ability to make behavioral changes, as well as barriers to change

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To maintain the pleasure of eating by providing nonjudgmental messages about food choices

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To provide an individual with diabetes the practical tools for day-to-day meal planning rather than focusing on individual macronutrients, micronutrients or single foods

The American Association of Clinical Endocrinologists (AACE) guidelines have similar goals for people with type 2 diabetes. (3)

4 0
3 years ago
Read 2 more answers
Earth is unique in the solar system because it has a relatively stable and mild (blank)
Alexandra [31]

Several conditions make our planet earth unique, to answer this statement we need to understand that.....

<h3>Earth is unique</h3>

There are many planets in the solar system, however, none have a location like planet Earth. Our planet is in a privileged condition, as it is located at a distance from the sun that does not prevent the emergence of elements essential for sustaining life, that is to say, it is not very close, a fact that would raise temperatures, and very far away, when they would be very low, hindering the development of lives.  This factor was decisive for the formation of liquid water on planet Earth, since it is the only one with such a resource in the solar system.

With this information we can come to the conclusion that the statement is <u>correct,</u> the stability of the earth and location in the solar system, provided that the earth could have water in a liquid state.

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3 0
2 years ago
Some amino acids are both glucogenic and ketogenic. Explain the difference between the two types and why some amino acids can be
vesna_86 [32]

Answer:

From the point of view of the type of molecule that is obtained after the degradation of the hydrocarbon skeleton, amino acids can be classified as: glucogenic and ketogenic. The main difference between glucogenic amino acids and ketogenic amino acids is that glucogenic amino acids can be converted to pyruvate or other glucose precursors, while ketogenic amino acids can be converted to acetyl CoA and acetoacetylCoA.

Explanation:

Glucogenic amino acids are amino acids that break down to pyruvate, alpha-ketoglutarate, succinyl Co-A, fumarate, and oxaloacetate and are so named because the synthesis of glucose from these molecules is feasible. Both pyruvate and the Krebs cycle intermediates noted above can be converted to phosphoenolpyruvate and subsequently glucose through gluconeogenesis.Ketogenic amino acids are the amino acids that generate acetyl-CoA or acetacetyl-CoA and are called by this name because they can cause ketone bodies. Since mammals lack the proper enzyme system, these compounds can never be used as precursors for glucose biosynthesis. Of the twenty universal amino acids, fourteen are purely glucogenic and two are purely ketogenic (leucine and lysine). The remaining four (isoleucine, phenylalanine, tryptophan and tyrosine) are glucogenic and ketogenic simultaneously since a part of the hydrocarbon skeleton originates precursors for the biosynthesis of glucose (pyruvate or Krebs cycle intermediates) and the other part acetyl-CoA or acetacetyl -CoA.

5 0
3 years ago
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Answer:

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7 0
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VARVARA [1.3K]
Hey there

The chemical symbol of carbon is "c" 

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<span>Electrons per shell: = </span><span>2, 4</span>
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