What type of variation is nessary for natural selection to occur

Answers

Answer 1

Answer:

Genetic variation

Explanation:

Genetic variability (diversity) stems from two basic processes: mutation and recombination.

If there were no mutations, all genes would exist in only one form, they would not have alternative forms.

Since phenotypic variability also depends on genetic variability, it is clear that the processes of mutation and recombination contribute to the creation of a large number of different phenotypes.


Related Questions

What is the energy input to the radiometer system? What form(s) of energy are present in the system as a result?

Answers

Answer:

What happens to the work done on a system? Energy is transferred into the system, but in what form? Does it remain in the system or move on? The answers depend on the situation. For example, if the lawn mower in Figure 1a is pushed just hard enough to keep it going at a constant speed, then energy put into the mower by the person is removed continuously by friction, and eventually leaves the system in the form of heat transfer.

Explanation:

because my mom told me

Where in the human male body do sperm form?

A. Epididymis
B. Penis
C. Urethra
D. Testis

Answers

Answer:

D.Testis

Explanation:

I remember learning this last year...

The answer is D
Explanation:
Got it right for my test

INEED Help thx :p with 5

Answers

the answer would be c

DNA is unique to each____________.
(A. Recipe
(B. Organism
(C. Identical twin
(D. Still Object

Answers

Answer:

Organism

Pft I can't aswer this question without writing 20 characters so yeah just fluffing

Answer:

B. organism

Explanation:

from the big bang that occurred 13.7 billion years ago came​

Answers

Answer:

huh

?

I'm confused on the question

Answer:

Our universe was born about 13.7 billion years ago in a massive expansion that blew space up like a gigantic balloon. That, in a nutshell, is the Big Bang theory, which virtually all cosmologists and theoretical physicists endorse. The evidence supporting the idea is extensive and convincing

Explanation:

Please help!! And thank you!!

Answers

Well, understand it :-

The temperature rises as you get higher in the stratosphere and in the thermosphere.Temperatures decrease as you gain height in the troposphere and the mesosphere.

2 genetic disorders ASAP

Answers

Answer: Down syndrome and cystic fibrosis

Answer:

downsyndrome

cystic fibrosis

Explanation:

Help me please !!!
Which event in meiosis increases genetic variation within a population?
A. DNA condenses to form chromosomes.

B. Segments of chromosomes cross over.
C. Chromosomes duplicate themselves.
D. Chromosomes form pairs.

Answers

Answer:

Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occur during prophase 1

What is the resource in the plant that aphids eat?

Answers

Answer: Aphids are herbivores. They suck plant juices out of the leaves, stems, or roots of plants. The juices they drink often have much more sugar than protein. Aphids have to drink so much sugary juice to get enough protein that they excrete a lot of the sugar.

Explanation:

I can confirm that it is correct.^
Aphids feed on soft stems, branches, buds and fruits. They pierce the stems and suck the nutrient rich sap from the plant leaving damaged flowers and fruits :)

interpret that was the worst of times and it was the worst of times.from a tale of two cities​

Answers

Answer

search it out

Explanation:

search

What happens during the process of cellular respiration?
edge nuity

Answers

Answer:

sourced from wiki

Explanation:

Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients into adenosine triphosphate (ATP), and then release waste products.

Macronutrients and Micronutrients: Mastery Test An individual with a protein deficiency typically experiences increased susceptibility to illnesses, muscle and joint pain, and diffic concentrating. Why does a protein deficiency cause such diverse symptoms? А. because the only role of proteins is to provide the enzymes that all cells need to function B. because proteins are the primary Reset Next​

Answers

Answer:

its B option  90% of our body is made up of protien so deficiency of protiens causes serious problems.

Explanation:

Which physical property is most helpful for separating a mixture of sand and
gravel?
A. Particle density
B. Boiling point
C. Particle size
D. Magnetic attraction

Answers

The answer is A particle density

Various methods can be employed in the separation of heterogeneous mixtures from a solution comprising the solute and the solvent.

The correct answer is:

Option C. Particle Size.

This can be explained as:

Sand and gravel have two different sizes and can be separated on the basis of particle sizes.

Sieving is a method that can be employed to separate gravel from sand.

Sand particles being small will pass through the sieve while gravel being big in size will remain on the top of the sieve.

Therefore, particle size will be the parameter by which sand and gravel can be separated.

To learn more about separation techniques follow the link:

https://brainly.com/question/10666014

Please I need help ASAP!!

Answers

Answer:

membrane becuase it filters what goes in and out of the cell

membrane :)) , seems more true bc those sent not

Which is considered a chemical mutagen? ​​

Answers

Answer:

The chemicals which help in imposing heritable changes in the genotype of an organism are termed as "Chemical Mutagens". "Hydroxylamine" (NH₂OH) and "Nitrous acid" (HNO₂) are chemical mutagens.

Explanation:

someone may ask you to distill a complicated idea into a brief summary that gets right to the point. how does this relate to distillation in chemistry

Answers

Answer:To separate two or more liquids by distillation, you first heat them in a flask. The more volatile liquid (the liquid with the lower boiling point) will typically evaporate first and the vapor will pass into a ... the refluxing liquid can condense, re-evaporate, and condense again, essentially distilling the ...

Explanation:

Distilling a complicated idea into brief summary that gets right to the point relates with distillation in chemistry in that both requires breaking a complex idea/substance into smaller component pieces.

In chemistry, distillation is a technique used for separating a liquid mixture into its components by allowing each component to boil, evaporate off the mixture, and then allowed to condense.

Because the each component of a mixture has different boiling point, this attribute is applied in distillation. The mixture is placed in a distiller and heated. At their respective boiling temperature, each component evaporates off the mixture and condenses at a collection point by a cooling water.

This is what it means when a complicated idea is being asked to be distilled. Such idea is to be broken down into smaller, concise ideas that can easily be executed as part of the whole idea.

More on distillation can be found here: https://brainly.com/question/15946045

Which organisms replicate cells by mitosis?
A. animals and bacteria
B. animals and plants
C. bacteria and plantS
D. darchaea and bacteria
E. archaea and plants

Answers

Answer:

B. because prokaryotes (bacteria) use binary fission instead of mitosis. i hope this works

What is
phosphorylase role in this signal transduction
pathway?
A) release glucose from glycogen. B) Activate the G-protien by attaching a ligand to the membrane protien
Activate the G-protein by attaching a ligand to the
membrane protein

Answers

Answer:

reeeeeekskksksksowowownamms

what makes a compound different than a mixture

Answers

Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.

how the body defends itself against infection

Answers

Answer: poop

Explanation: if you cover yourself in poop it heats your body up an animal does this but i cant remember which one

Answer:

Natural immunity: inborn defence. External defence is maintained by means of intact skin, by mucous, which traps and eliminates micro‐organisms, and by body secretions such as saliva and perspiration, which have disinfectant properties.

(T/F) Most cells reach a certain size, stop growing, and then divide.

Answers

Answer:

True

Explanation:

Most of the cells in the body of an organism reach a certain size, stop growing after a certain size, and then undergo division. Cells maintain the cell number in body through continuous division. Thus, the given statement is true.

What are Cells?

Cells are the basic unit of life. Cells are the building blocks of living organisms. The human body is composed of cells. These cells provide the structure for the body, take in nutrients from food, convert the nutrients into usable form of energy, and carry out specialized functions such as digestion, respiration, excretion, and circulation, etc.

Specialized cells in the body of an organism have a certain size and shape and these undergo growth and division. Cells undergo cell cycle which consists of different phases such as interphase and M-phase where the cell grows in size and shape and divides to form more cells and thus maintain their number.

Learn more about Cell here:

https://brainly.com/question/3142913

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Both the tropical rain forest and the tropical savanna experience/contain:

Answers

Answer:

I believe they both experience heavy rainfall. Although the tropical savanna has a wet season, it also has a dry season.

Hope I could help.

What is the function of the sporangium?

Answers

Answer:

A sprongium is a structure in certain plants and other organisims that is charged with making and storing spores.

Explanation:

"A sporangium (plural: sporangia) is the capsule structure belonging to many plants and fungi, in which the reproductive spores are produced and stored. All land plants undergo an alteration of generations to reproduce; the sporangium is borne upon the sporophyte, which is the asexual second generation structure."

I hope this helped! :D

Answer:

protects the developing mother spore cells

Explanation:

got 100% on the quiz

Mitosis produces which cell type?
haploid
diploid
chromosome
gamete

Answers

Answer:

b, diploid.

Explanation:

Mitosis produces two diploid somatic cells, genetically identical to each other and the parent cell.

Mitosis produces diploid cells (option B)

What is Mitosis?

Mitosis is a process of cell division observed in cells. Its primary purpose is to ensure that the genetic information, in the parent cell is equally distributed among the resulting daughter cells.

During mitosis the process generates cells that are diploid, meaning that the number of chromosomes in the parent cell is the same as the number in the resulting daughter cells.

In contrast haploid cells have half the number of chromosomes found in cells. Examples of haploid cells include sperm and eggs which are known as gametes.

Notably, we can conclude that mitosis produces diploid cells (option B)

Learn about Mitosis here https://brainly.com/question/1186551

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If f(x) = 3x - 1 and g(x) = x + 2, find (f- g)(x).
Rrgggggg

Answers

Answer:

(f - g)(x) = 2x - 3

General Formulas and Concepts:

Pre-Algebra

Distributive Property

Algebra I

Combining Like Terms

Explanation:

Step 1: Define

f(x) = 3x - 1

g(x) = x + 2

(f - g)(x) is f(x) - g(x)

Step 2: Evaluate

Substitute:                    (f - g)(x) = 3x - 1 - (x + 2)Distribute -1:                 (f - g)(x) = 3x - 1 - x - 2Combine like terms:    (f - g)(x) = 2x - 3

1. Which image represents the flow of a longshore current in relation to a sandy beach?​

Answers

Answer: Option C

Explanation:

When waves of water approach the beach, they do so as an angle because they have been slowed down by the first parts of the beach that they have encountered.

When they hit the beach at an angle, they come back to the water and keep doing so like the movement shown in option D. This constant motion moves the sand and other particles on the beach progressively and the current that does so is the Longshore current which moves parallel to the coastline.  

Janelle is preparing to audition for a position in her community dance company. She has been practicing a series of dance steps from a performance she did the previous year. What two major parts of her brain will be most active as she practices? (1 point)

Thalamus and pituitary gland

Hypothalamus and brain stem

Cerebellum and the temporal lobe

Medulla oblongata and pons
(WILL GIVE BRAINLIEST!!)

Answers

Answer:

i think the cerebellum and the temporal lobe is the answer since they promote physical and mental ability

Explanation:

hope this helps

Which depressive disorder features symptoms that are milder but longer lasting than the symptoms of the other depressive disorders?
Double depression
Major depressive disorder, single episode
Major depressive disorder, recurrent
Persistent depressive disorder

Answers

Answer:

Dysthymic disorder

Explanation:

The symptoms of dysthymia are similar to those of major depression but are less severe. However, in the case of dysthymia, symptoms last longer. A person has to have this milder depression for more than two years to be diagnosed with dysthymia.

Answer:

hi

Explanation:

where is the dna located in the eukaryotic cell

Answers

Answer:

Nucleus

I did this and I think it was right

Answer:

nucleus

The nucleus is particularly important among eukaryotic organelles because it is the location of a cell's DNA.

Science is an attempt to explain
A. the truth concerning all things in Science
B. the supernatural
C. superstitions
D. natural phenomena

Answers

A. The truth concerning all things in science

Answer:

its D i took the k12 test i hope this helps

Explanation:

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