Biology College

Which factors affect natural selection?
1. inheritance, isolation, adaptation
2. variation, overpopulation, adaptation
3. isolation, overpopulation, speciation
4. variation, inheritance, speciation

Answers

Answer 1

Answer:

The correct answer is B) Variation, overpopulation, and adaptation

Explanation:

Edge 2021

Which Factors Affect Natural Selection?1. Inheritance, Isolation, Adaptation2. Variation, Overpopulation,
Answer 2

Variation, overpopulation and adaptation are the factors that affect natural selection.

What are the factors that affect natural selection?

A mechanism that makes the populations of living things to change with time is natural selection. For natural selection to take place, four conditions are required to occur:

ReproductionHeredityVariation in organismVariation in individual characters

Some of the factors that affect natural selection are:

Overpopulation or overproductionVariationCompetitionAdaptation

For natural selection to occur, there should be higher reproductive success as well as variability. Ultimately, natural selection makes individuals within a population to adapt with the changing environment.

Thus, the correct answer is option 2.

Find out more information about natural selection here:

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Related Questions

18) What is the difference between eumelanin and pheomelanin?

Answers

Answer:

Eumelanin is black or brown pigment and pheomelanin is red or yellow pigment

What happens when cerebrum of brain get injured?

Answers

Mild traumatic brain injury may affect your brain cells temporarily. More-serious traumatic brain injury can result in bruising, torn tissues, bleeding and other physical damage to the brain. These injuries can result in long-term complications or death.

1
Which is NOT true of homologous chromosomes? *
(1 Point)
they are identical
they have genes for the same traits
they are in pairs
they have genes that are in the same order

Answers

Answer:

Homologous chromosomes are NOT identical.

Explanation:

They contain slight differences in their genetic information, allowing each gamete to have a unique genetic makeup. Consider that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent.   Hope this helps :)

Please help whoever’s right will get brainliest

Answers

Answer:

1: LAW

2: THEORY

3: THEORY

4: THEORY

Explanation:

A simple random sample of 25,000 individuals are surveyed in order to determine the prevalence of individuals that contracted the flu in the past year. Assuming 4,250 individuals indicated they had been diagnosed with the flu at some point in the past year, what is the prevalence of flu for the past year, as indicated from the survey participants?
A. 8.30%
B. 83.0%
C. 17.0%
D. 1.70%

Answers

Answer:

C. 17.0%

Explanation:

A random sampling of human populations is done to check the frequency of a particular infection. The proportion of the individuals in the total population that suffered the infection at any time during the year are counted. The proportion of the individuals infected any time during the year is divided by the total number of the individuals surveyed and the percentage is taken to calculate the prevalence of the infection in the sampled population.

Here, the total number of the individuals that were infected with flu in the last year= 4250.

The total number of the checked individuals= 25,000.

So, the proportion of the individuals infected with flu in this population= 4250/25000 x 100= 17%

Answer: It is C. 17.0%

Explanation:

A student is investigating how substrate concentration affects the rate of anenzyme-catalyzed reaction. Which ​threevariables​ should be kept constant in the setup of thestudent’s investigation? Select all three variablesA. temperature of the reactionB. amount of enzymeC. amount of substrateD. amount of productE. pH of the reaction

Answers

Answer:

A. temperature of the reaction

B. amount of enzyme

E. pH of the reaction

Explanation:

Temperature should be kept constant because enzymes operate at different activity rates depending on the temperature. The same goes for the pH as well with different enzymes having different optimal pH levels.

The amount of enzyme should be kept constant as well because different concentrations of enzymes can determine how fast the reaction will occur.

Essentially anything that could affect enzyme activity apart from substrate concentration should be kept constant.

How can structural changes to DNA effect the structure and function of an organism?

Answers

Mutations.


Mutations are permanent changes made to DNA that can change how a gene is expressed.

The structural changes to DNA affect the structure and function of an organism, such as in a mutation. When the mutation occurs, the DNA structure changes, which in turn affects gene function.

What effect does mutation have on an organism?

When a mutation occurs in the gene segment, then the structure and function of the gene are affected, especially when the exon portion of the gene is affected, and the mutation can be caused either by radiation or any other chemical factors and can cause many types of mutation, such as the nucleotide mutation, base mutation, etc. Apart from that, gene function is also affected when the gene is present in the heterochromatin region.

Hence, structural changes to DNA affect the structure and function of an organism, such as in a mutation. When the mutation occurs, the DNA structure changes, which in turn affects gene function.

Learn more about the mutations in organisms here.

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What is the difference between the cell membrane and the cell wall?

Answers

Answer:

Cell membrane helps to enclose the cell organelles and cytosol inside a cell. ... A cell wall is a ridgid, protective layer and it covers the cell membrane. For plants, cell walls are mainly made up of cellulose, while a cell wall in bacteria is made up of peptidoglycan,and for fungi it is made up of chitin.

Explanation:

Imagine you could shrink to the scale of the tiny particles that make up matter and move around in a cup of hot chocolate. Write about or draw (and then upload) what you would experience.

Answers

Answer:

can you make my friend............

Is this correct? Also ill mark Brainliest.


What are the roles of consumers? Select two options.

1. to create usable food energy
2. to balance the number of producers in an ecosystem
3. to break down dead organisms
4. to eat other organisms
5. to provide energy for producers

Answers

The answers are 2 and 4 because consumers kill to eat which balances the number of producers and they eat other organisms

The answer is : 2 &’ 4.

Which would be the best approach for a student to use in determining
whether an unidentified block is made of metal?
A checking its color
B. determining its mass
C. determining its weight
D. checking its conductivity

Answers

I would answer that as Answer D) Checking it’s conductivity

The normal pulse rate is ___________. *
1. 70 to 90 per minute
2. 70 to 80 per minute
3. 40 to 70 per minute
4. 70 to 100 per minute
Class 7

Answers

A normal pulse rate is 70 to 100 per minute

C. 70 to 100 per minute

How do the daughter cells compare genetically to the original parent cell after mitosis?

Answers

Answer:

after mitosis there are two daughter cells, which are genetically identical to the parent cells.

Explanation:

The daughter cells are identical to the parent cells because the cell copies/ replicates its chromosomes. Then it splits the chromosomes equally so that each daughter cell has a complete set of chromosomes.

Parent cell give rise to daughter cell being genetically identical because of it replicates the DNA, so after mitosis, both daughter cell is genetically identical to the parent cell.

How daughter cell is genetically identical to the parent cell?

Mitosis results in the formation of two identical daughter cells, each with the same number of chromosomes as the parent cell.

Meiosis, on the other hand, produces four distinct daughter cells, each with half the amount of chromosomes as the parent cell. Because DNA replicates to complementary to other DNA strands.

The mature cell that is undergoing cell division is known as the parent cell or the mother cell, and the new cells that emerge at the conclusion of the cell division are known as daughter cells.

Therefore due to DNA replication daughter cell is genetically identical to the parent cell after mitosis.

Learn more about daughter cell is genetically identical to the parent cell, here:

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4. Take a beaker (jar or jug) with some water and put some drops of red or blue
ink in it. Take a tender twig of any flowery plant with leaves and flowers, preferably
white flowers, and put it in the beaker for 6 to 8 hours. What do you observe? For
further examination cut across its stem and look for the presence of colored water.
Explain your observations.​

Answers

Answer:

Blue Ink patches are observed on the leaves of the plant. Also, on cutting across the stem of the plant, the red color of the solution is found along the length of the stem.

The above observation shows that the stem of the plant conducts water through its length to the leaves of the plant.

Explanation:

The leaves of plant obtain water and minerals from the soil through the roots of the plant. The water is conducted by the stem of the plant from the roots to the leaves of the plant where they are needed for photosynthesis as well as for cooling the plant. The xylem tissue in plants is responsible for conducting water to the leaves of the plant from the roots of the plant through the stem.

The conduction of water from the roots to the leaves of the plant is maintained by capillary action as well as by transpiration pull. Transpiration pull refers to the pull of water by the transpiration action taking place in the leaves of the pant, whereby water evaporates from the leaves of the plant through the opening in the leaf of the plant.

When the blue ink is added to the water, the colored water is conducted through the stem of the plant to the leaves. On getting to the leaves, the water molecules evaporate leaving behind the colored patches fond on the leaves. When the stem of the plant is cut, the blue color is seen along its length showing that the colored water was conducted through it.

PLEASE HELP. Which organelle is a place for storage of materials within the cell? *
Vacuoles
Nucleus
Mitochondria
Ribosomes

Answers

Vacuole remember it as a vacuum and it keeps everything in

Answer:

vacuole

Explanation:

the nucleus is the control center

the mitochondria is the power house

ribosomes deal with proteins

hope it helps:)

What makes the climate different in the different biomes earth?​

Answers

Answer:

The animals  the different kinds of weather in that biome. Where it is located.

Explanation:

Which optical phenomena are formed by ice crystals?

Answers

Halo, any of a wide range of atmospheric optical phenomena

Air pollution is a major health problem caused by the burning of fuels in
a.vehicles.
b.power plants and factories.
c.home furnaces.
d.All of the above

Answers

Answer:

D

Explanation:

all of those contribute to air pollution

Answer: D

Explanation:

What do we call the freeze dried state that Monerans enter to survive harsh conditions ?
HELPPPPPPP

Answers

Answer:

dddďdddddddddddddddddddddd

Answeer: cell state

Explanation:

explain which direction the molecules will move during diffusion?

Answers

Answer:

Up and down

Explanation:

In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space.

Answer:

Molecules will move from an area of high concentration to an area with lower concentration.

An amoeba ingests large food particles by​

Answers

From a method called phagocytosis.

Five substances that are not pure

Answers

EXAMPLEs of not pure substances out your computer , a mixture of salt and sugar , a tree , gravel , rocks

Which type of star cluster forms from tightly packed groups of older stars?​

Answers

Answer:

Which type of star cluster forms from tightly packed groups of older stars?

binary

eclipse

globular

open

Its c

Explanation:

I did the quizz

Why is it important for DNA to remain in the nucleus?

Answers

DNA cannot leave the nucleus because that would risk it getting damaged.
The most important function of the nucleus is to store the cell's genetic information in the form of DNA. DNA holds the instructions for how the cell should work. DNA stands for deoxyribonucleic acid. The molecules of DNA are organized into special structures called chromosomes. Sections of DNA are called genes which hold hereditary information such as eye color and height. You can go here to learn more about DNA and chromosomes.

Plasma membranes allow certain materials to pass through them. Investigate how this property contributes to homeostasis.

Answers

Answer:

this

The Plasma membrane maintains the homeostasis throughout a cell because it filters what substances go in and out of the cell. If there is too much of a substance in a cell the plasma membrane quickly disposes it and when there is not enough of a substance in a cell the plasma membrane lets the substance in.

or this

A major role of the plasma membrane is transporting substances into and out of the cell. The plasma membrane is selectively permeable, allowing only certain substances to pass through. ... Cell transport helps cells maintain homeostasis by keeping conditions within normal ranges inside all of an organism's cells.

one of them should have been the answer ;)

What is physical appearance of traits called?

Answers

Answer:

Explanation:

The observable traits expressed by an organism are referred to as its phenotype. An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype.

Which of the following statements is true?

a)  only males can get an X-linked. disorder.
b) only females can get an X-linked disorder.
c) only males can get a Y-linked disorder.​

Answers

Answer:

The answer is a

Explanation:

X-linked disorders result from mutated genes on the X chromosome. Males, who have only one X chromosome (i.e., they are hemizygous), will fully express an X-linked disorder. On the other hand, females, who have two X chromosomes, will be carriers of the defect in the majority of cases, and so they are usually asymptomatic.

When amino acids are linked together to form chains the molecule formed is called what?

Answers

Answer:

Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.

Explanation:

Darwin’s explanation for evolution was dependent on which scientific concept?

Answers

Answer:

The existence of variations in population.

During photosynthesis, what is the source of the carbon in
the sugar (C6H12O6) that is created?

Answers

Answer:

Carbon Dioxide

Explanation:

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