A farmer uses DDT to kill insects in his field. The first year nearly all of the insects were killed. By the fourth year, however, nearly all of the insects survived the DDT treatment. Explain the process of natural selection in this population of insects. Include these words - mutation, phenotype, variation, resistance, adaptation, and differential survival.

Answers

Answer 1

Answer:

Explanation:

Selection is the greatest force that alters gene frequency and brings about variation that is evidence in a population. There are both natural and artificial selection.

Mutation is one of the force that alters population frequency it is an heritable change that is sudden and occur in the gene, it can be induced or caused naturally.

The insect survived the DDT used because over the years they have build immunity and resistance against the chemical, they now mutate and produce gene that becomes resistance to the chemical and now adapted or adaptable to the environment. Natural selection helps in the continuous perpetuation of the new phenotype and a new differential survival rate.


Related Questions

What is the relationship between wolves and caribou? Caribou are predators, and wolves are a source of food for them. Wolves usually take the weakest member of a caribou herd as prey. Caribou eat the animals that eat the plants that wolves need to survive. Wolves eat the plants that are poisonous to the caribou.

Answers

Answer:

it is a ecostyem were they help each other out by eating what the other one doesn't need

Explanation:

Which molecule is primary responsible for the differentiation of cells

Answers

RNA molecules is the right answer... RNA molecules are an important type of intracellular differentiation control signal. The molecular and genetic basis of asymmetric cell divisions has also been studied in green algae of the genus Volvox, a model system for studying how unicellular organisms can evolve into multicellular organisms.

Hope it helps you...

In Mendel's first set of experiments, the two forms of a trait always showed up in the ______ generation

Answers

Answer:

Mendel began his studies by growing plants that were true-breeding for a particular trait. ... In his first experiment, Mendel cross-pollinated two true-breeding plants of contrasting traits, such as purple and white flowered plants. The true-breeding parent plants are referred to as the P generation (parental generation).

Explanation:

Hope this helps a little. Pls mark brainliest.

In Mendel's first set of experiments, the two forms of a trait always showed up in the Parental generation or P generation.

What is parental generation?

The parental generation is defined as the first set of parents crossed, where the genotypes of the parents will be used as the basis for predicting the genotypes of their offspring (the [tex]F_1[/tex]generation). The P generation is the beginning of Mendel's work on inheritance, or the acquisition of genetic traits by transmission from parents to offspring.

Mendel collected the seeds which is produced by the P plants that resulted from each cross and grew them, while their offspring were called the[tex]F_1,[/tex] or the first filial generation.

Thus, in Mendel's first set of experiments, the two forms of a trait always showed up in the Parental generation or P generation.

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Put in order.
Put the following steps of protein synthesis in order.
1
2.
3
editing
transcription
translation
Clear selection

Answers

Answer:

Translation of an mRNA molecule by the ribosome occurs in three stages: initiation, elongation, and termination. During initiation, the small ribosomal subunit binds to the start of the mRNA sequence. ... Lastly, termination occurs when the ribosome reaches a stop codon

Explanation:

The main protein synthesis steps are: Initiation, Elongation, Termination.

Hopefully this helps. :)

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Answers

Answer: earthquake

Explanation: earthquakes shake and have these techtonic plates. this causes the ground to break.

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Select the terms that are evaluated before assigning a Koppen-Geiger Scale rating.

•exposure
•latitude and longitude
•humidity and precipitation
•commercial crops
•local native plant life
•soil content
•elevation above sea level
•temperature extremes

Answers

Terms included in the Koppen-Geiger scale classification are: humidity and precipitation, and local native plant life.

What is the Koppen and Geiger climate classification?

The Koppen climate classification is a classification created in 1884 in which the different types of climate are described and associated with a series of letters, usually three, that indicate the behavior of temperatures and precipitation.

Additionally, this system is based on the natural vegetation of different parts of the world because this factor is related to climate, especially the limits between one climate and another.

According to the above, it can be inferred that the correct terms are: humidity and precipitation, and local native plant life.

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What conversion factor fraction is used to convert
gallons to liters?
3.8 liters
A. 1 gallon
1 gallon
B. 3.8 liters
1 liter
C. 4.2 cups
4.2 cups
D.
1 liter
SUBMIT

Answers

C. 4.2 cups. I think

Discuss TWO ways in which some cultural views that exist may affect
a relationship negatively
(​

Answers

Culture can introduce strains in  a relationship.

What are cultural views?

The term culture is regarded as the totality of the way of life of a people. Civilizations are rooted in the culture of the people this is why whole societies can never be alienated from their culture.

However, where there is a disparity in cultural orientation;

A relationship is prone to misunderstanding as people will approach matter from different perspectives.Their is an increased chance of alienation of different groups due to cultural bias.

Hence culture can introduce strains in  a relationship.

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Why do skin cells grow back when skin cells get damaged

Answers

Answer: The ability of the skin to heal even after considerable damage has occurred is due to the presence of stem cells in the dermis and cells in the stratum basale of the epidermis, all of which can generate new tissue. ... These active cells produce collagenous fibers and ground substance. Hope this helps can u give me brainliest

Explanation:

Do cells shrink or swell until they become isotonic?

I am referring to osmosis, hypotonic and hypertonic solutions.

Thank you for the help.

Answers

Answer:

they neither shrink or swell they remain the same

Explanation:

there is no water movement

How are green algae related to land plants? (Select all that apply.)
both have chloroplasts
both lack a cell wall
both have a cell nucleus
both lack a cell nucleus
both have a cell wall

Answers

Answer:

bro whats the real answer i got a 70 percent bc the person who answered and the owner of this question said thank you i thought it was legit dang

Explanation:

The green algae relate to land plants in the following ways:

They both have chloroplasts.Both have a cell nucleus.Both have a cell wall.

Thus, the correct options are A, B, and E.

What are Green algae?

Green algae may be defined as a type of eukaryotic organism that has photosynthetic pigments a and b. Such a type of algae also stores carbohydrates as starch.

Green algae mostly live in freshwater environments, ranging from unicellular flagellates to more complex multicellular forms.

Both land plants and green algae have a photosynthetic organelle known as chloroplast. The cell wall of land plants as well as green algae are made up of cellulose, hemicellulose, and pectins.

Both eukaryotic classifications possess a well-defined cell nucleus, nuclear membrane, and other membrane-bound cell organelles.

Therefore, the correct options for this question are A, B, and E.

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How does smoking affect the cardiovascular system directly

Answers

Answer:

The answers are A,B,E. If you can give only one answer, then it's B

Do these concepts apply to politics and advertising as well as person-to-person persuasion? Can you think of some examples?

Answers

What are the concepts...?

What does selectively-permeable mean?
Nothing gets through
The cell lets only large substances through
The cell controls what passes in and out of the cell

Answers

The cell controls what passes in and out of the cell

Answer:

The cell controls what passes in and out of the cell.

Explanation:

Consciousness is: __
A. neural firing in the hindbrain.
B. role playing.
C. the conflict between two parts of the brain.
D. awareness of ourselves and our environment.

Answers

Answer:

D. awareness of ourselves and our environment.

Explanation:

An individual's awareness of external events and internal sensations under a condition of arousal, including awareness of the self and thoughts about one's experiences, as well as the body and perspectives.

Answer:

D

Explanation:

Just think about it like this:

Unconscious=Unaware

Conscious=Aware

What is a constructive relationship​

Answers

Answer:

A constructive relationship is a relationship characterized by flexibility of role, mutual concern for members needs, as well as other factors. So in a constructive relationship, the people involved are concerned with one another's needs. It's not just self-centered, the person's own needs.

In cats, the allele (B) produces black color but (b) produces a yellow color. These alleles are incompletely dominant to each other. A heterozygote produces a tortoise shell color. The alleles (B) and (b) are sex-linked as well. Cross a tortoise shell female with a yellow male.
A.vWhat percent of their offspring will be yellow?


B. What percent of their offspring will be black?


C. What percent of their offspring will be tortoise shell?


D. Why is it impossible to have a tortoise shell male offspring?

Answers

Answer:

a. 50%

b.25%

c. 25%

d. Why is it impossible to have a tortoise shell male offspring? the x chromosome, a male can only have one copy of the allele - either B. orb, not both!

Explanation:

Alleles can be referred to as alternate forms of a gene. Incomplete dominance refers to two true-breeding parents crossed to give an intermediate phenotype.

The allele (B) produces black color but (b) produces a yellow color.  A heterozygote produces a tortoise shell color (Bb)

Cross a tortoise shell female with a yellow male.

     Bb x bb

Bb Bb bb bb

c.  Bb --- 50% tortoise shell color

a.  bb  --- 50% yellow color.

b. No black -- 0%.

d. The males offspring cannot be tortoise shell because they have just the one X chromosome on which this gene resides. So they are either black or yellow.

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Type of democracy where citizens elect leaders to represent them in government dictatorship representative democracy oligarchy anarchy

Answers

Answer:

representative democracy

Explanation:

Democracy can be defined as a government of the people, by the people and for the people.

There are two (2) main types of democracy and these include;

I. Representative democracy: it's also known as indirect democracy and can be defined as a form of government which typically involves the process of having the citizens of a particular country vote to elect representatives (political leaders) to enact laws, create policies and make decisions on their behalf.

Hence, representative democracy is a type of democracy where citizens elect leaders to represent them in government.

II. Direct democracy: it can be defined as a process which typically involves the candidates voting for their preferred choice. Thus, their choices are reflected directly on the subject matter.

Generally, the type of government in which legislators such as senators or house of representative members are found is known as a democracy and they are saddled with the responsibility of enacting or making laws.

In watermelons, the gene for green fruit (G) is dominant to the gene for striped fruit, and the gene for round shape (R) is dominant to the gene for oval shape. Suppose a plant with genotype GGrr, is crossed with a plant with genotype ggRr. What would be the expected phenotypes among the offspring?
 
F. 100% green and oval.

G. 50% striped and round; 50% striped and oval.

H. 100 % green and round.

J. 50% green and oval; 50% green and round. 


Answers

Answer:

It's J

Explanation:

It's a 50/50 chance as the both alleles are dominant

The breakdown of food takes place in the mouth, stomach and small intestine. Name the type of digestion for which the teeth in the mouth are responsible. ​

Answers

Answer:

It is Chemical

Explanation:

Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.

Which is an example of how traits can be influenced by the environment?

Answers

A moth species slowly camouflaging into its environment

What do these questions mean ? WILL GIVE BRAINLIEST :) pls give an example or answer

Answers

Answer:

There must be another half but if there isn't its asking what about that animal what it is and the development and diversification of the animal

Which sequence best represents sexual reproduction?

Mitosis → Sex cells → Zygote → Fertilization
Sex cells → Meiosis → Mitosis → Fertilization
Fertilization → sex cells → Meiosis→ Zygote
Meiosis → Sex cells→ Fertilization → Zygote

Answers

Answer:

Meiosis → Sex cells→ Fertilization → Zygote

Explanation:

Answer:

(4). meiosis → sex cells → fertilization → zygote.

Explanation:

Sexual reproduction can be defined as a type of reproduction, in which new living organisms are produced by fusion of gametes produced by two organisms of different sexes.

The first step in sexual reproduction is meiosis that involves formation of haploid gametes (eggs in females and sperms in male) from diploid gamete-forming mother cells.

In next step, the male gamete (sperm) and female gamete (egg) fuse together, which is known as fertilization. Fertilization leads to development of a single-celled, diploid zygote. Later on, the zygote divides and differentiates into multicellular diploid organism.

Thus, the correct answer is option (4).

Answer:

Meiosis - Sex cells - Fertilization - Zygote

Explanation:

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HURRYYYYYYYYYY

Answers

Answer:

The results of restoration of this kind can include improved habitats for fish, birds and other wildlife, protection against flooding, better water quality, enhanced recreational opportunities, and increased economic opportunities through activities such as commercial fisheries and tourism.

Explanation:

A F1 pea plant carries Yy alleles for seed color. Explain
what would happen to these alleles during gamete
formation

Answers

Answer:

During the formation of the gametes (i.e. meiosis) we have the separation of the sister chromatids and the independent segregation of the alleles: this means that one of the gametes will carry the "allele Y" and the other the 'y allele"

A numbered diagram of the Earth's layers is shown below.

Answers

Answer:

1 & 5

Explanation:

:)

pure liquid water is described as neutral because the water pH is

Answers

Answer:

The pH of Pure Liquid Water is 7.

Explanation:

Anything lower than a 7 on the pH scale is acidic. Anything higher than 7 is considered basic. The average pH of liquid water is between 6.5 to 8.5. So, it the water is neutral because it is neither acidic nor basic. It is neutral.

This answer was also answered on other people's questions, and the highest rated ones got the same answer. Good Luck !

Why does the element carbon create such different minerals as diamond and graphite ?

Answers

Carbon has four available binding sites and depending on how one atom binds to other atoms, it can form different structures. If you look up the structure of diamond and graphite, you’ll see that they are all made out of carbon but they are arranged differently.

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Answers

Answer: thats a vagina my dude

Explanation:

can someone give me a summary of dna replication?

Answers

Answer:

dna

Explanation:

DNA replication is one of the most basic processes that occurs within a cell. Each time a cell divides, the two resulting daughter cells must contain exactly the same genetic information, or DNA, as the parent cell. To accomplish this, each strand of existing DNA acts as a template for replication.

DNA replication is the process by which DNA makes a copy of itself during cell division.
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