8. When the gene pool of a population remains constant and does not change, that population is said to be in ?

Answer: A.  Jogger sweating after a run.

Explanation: I took the quiz. ;)

The best example of water regulating an organism’s body temperature is a fish passing water over its gills, which is the second option, as the fish gill maintains the body temperature and maintains the oxygen and carbon dioxide concentrations too.

The water-regulating system in an animal body maintains homeostasis in the body, such as electrolytes homeostasis, such as ions such as sodium and potassium in body fluids, and the lungs ,skin, play a role in regulating water balance through respiration and sweating to maintain temperature of the body.

Hence, the best example of water regulating an organism’s body temperature is a fish passing water over its gills, which is the second option, as the fish gill maintains the body temperature and maintains the oxygen and carbon dioxide concentrations too.

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The statement that explains why randomized controlled trials are often "double blind" is as follows: to decrease bias by ensuring both the participants and researchers do not know who is receiving the treatment and who is not (option B).

Double-blinded experiments are forms of scientific testing in which some information is withheld from two different parties.

In summary, neither the tester nor the subjects tested know which are the control items and which are the test items.

A double blinded is conducted to reduce or eliminate bias between the participants and researchers.

Therefore, the statement that explains why randomized controlled trials are often "double blind" is as follows: to decrease bias by ensuring both the participants and researchers do not know who is receiving the treatment and who is not.

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Answer:

Independent assortment and crossing over contribute to diversity within a population's gene pool. These processes occur during meiosis and result in the recombination of DNA.

Explanation:

♥☺ hope it helped

The three pillars of Darwin's theory of evolution are genetic variety, fitness, and adaptation. Overproduction and competition are other crucial components of this process.

Charles Darwin's theory of evolution is known as natural selection. Due to the limited supply of resources in nature, animals have inherited traits that aid in both survival and reproduction.

Typically, produce more offspring than their contemporaries, leading to an increase in the frequency of such traits across successive generations.

Natural populations exhibit variation, and every population has more offspring than the environment can support. The result of this Overproduction is that those people who have the highest level of environmental genetic fitness will have offspring who are better able to compete in that environment.

Therefore, Genetic variation, fitness, and adaption are all factors in Darwin's theory of evolution.Overproduction and competition are other crucial components of this process.

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Speciation events can be caused by prezygotic barriers that prevent populations of organisms from mating with one another. This assertion is accurate.

Reproductive isolation is the condition in which biological barriers prevent members of two species from interbreeding. Prezygotic barriers: prevent ova from fertilizing if members of different species try to mate, or prevent mating across species.

Hybrids are more likely to form in populations divided by physical barriers that cause speciation because people cannot physically interact with one another. The hybridization zone is a region of habitat where this kind of interaction and mating frequently takes place.

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Answer:

Hope this helps a bit, sorry if it doesn't. Have a good day/night! :}

Explanation:

Steroid Hormone: It is thought that, because of their lipophilic nature, free steroid hormones enter target cells primarily by passive diffusion through the cell membrane. After gaining entry to the cell, steroid hormones act as ligands for nuclear receptors and alter gene transcription

Protein Hormone: Small uncharged molecules can diffuse freely through a phospholipid bilayer. However, the bilayer is impermeable to larger polar molecules (such as glucose and amino acids) and to ions. These molecules pass across membranes via the action of specific transmembrane proteins, which act as transporters.

Water/Ion: Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.

A substance that will easily pass through the membrane is: B. steroid hormone.

A membrane can be defined as the thin layer that separates the ineterior of a living cell from another, especially by forming its outer boundary or layers.

This ultimaetly implies that, a membrane provides protection for a living cell or an internal cell compartment from its environment.

In conclusion, a steroid hormone is a substance that will easily pass through the membrane.

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Answer:

A

Explanation:

Hi,

The answer is D

Hope this helps

Answer:

There will start to be less and less green beetles because they are being eaten.

Explanation:

Answer:

I needed to use a water plant because it is most easily seen in water plants with the production of oxygen by photosynthesis.

You need to leave the apparatus in a light place because green plants absorb light into their leaves and convert it to energy by photosynthesis.

Answer:

1. chlorophyll : because animals cannot produce their own food

2. Tonoplast: it is a membrane that surrounds the large vacuole in a mature plant cell and vacuoles are not present in animals cell or if present little

Answer:Biodiversity. The variety of organisms in a given area. Succession. The replacement of one community by another at a single place over a period of time. Pioneer Species.

Explanation:

The given statement that the declaration made in the early 19th century that no future European colonization of the American continents would take place is true.

In the early 19th century, the United States made an announcement known as the Monroe Doctrine, declaring that the American continents were not open to further colonization by any European country. This policy was put in place to protect the sovereignty of the newly independent nations in the Americas and prevent European interference.

The doctrine also stated that any attempts by European powers to colonize or interfere with countries in the Americas would be viewed as acts of aggression and provoke a response from the United States, the statement is true.

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The mass of the wax after the melting would still be exactly 50 g

A cornerstone of physics and chemistry is the law of conservation of mass, commonly referred to as the principle of mass conservation. It asserts that mass cannot be created or removed in a closed system.

In other words, the total mass of a closed system remains constant over time, regardless of any physical or chemical changes that may occur within the system.

Since the mass of the wax would not change, it would be right to say that by this law, the melted wax would stull weigh 50g

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Density is a physical property of matter.

The correct option is (b) Physical property

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Answer:

Transcription is responsible for most gene regulation in prokaryotes but in eukaryoes gene regulation is more complicated and genes are regulated before and after transcription. And another difference is that eukaryotes don't express their genes all at once; they express one at a time. Prokaryotes do.

Explanation:

When the concentration of sodium ions in tissue fluid is too high, intracellular fluid moves into the extracellular fluid compartment.

What is Intracellular fluid?

The fluid that resides within of cells is called intracellular fluid. The fluid located outside of cells, or extracellular fluid, is known as interstitial fluid. Extracellular fluid is classified into two categories: fluid found in blood and fluid found outside blood.

Phosphorus (PO4 P O 4 ), magnesium (Mg2+ M g 2 +), and potassium (K+) are a few of the major electrolytes found in intracellular fluid.

Therefore, Option A is correct.

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A. Herpes Simplex Virus 1 is a DNA virus.

B. The replication of the genome in DNA viruses and RNA viruses differs in terms of the enzymes involved and the process itself.

A. Herpes Simplex Virus 1 (HSV-1) is a DNA virus. DNA viruses have their genetic material in the form of double-stranded DNA, which serves as a template for replication.

B. DNA viruses replicate their genomes using host cell machinery. The replication process involves several steps. First, the viral DNA is uncoated and released into the host cell's nucleus. The viral DNA then serves as a template for the synthesis of complementary DNA strands. DNA polymerase, an enzyme, catalyzes the addition of nucleotides to the growing DNA strand. Once the DNA strands are synthesized, they can be transcribed into viral RNA or serve as templates for the production of viral proteins. The replicated DNA is packaged into new viral particles, which can then infect other cells.

In contrast, RNA viruses have their genetic material in the form of single-stranded RNA. The replication of RNA viruses involves different enzymes and mechanisms. RNA viruses can be divided into positive-sense RNA viruses, negative-sense RNA viruses, and retroviruses. Positive-sense RNA viruses can be directly translated into viral proteins by host cell ribosomes. Negative-sense RNA viruses require the synthesis of a complementary RNA strand before protein translation can occur. Retroviruses, such as HIV, use the enzyme reverse transcriptase to convert their RNA genome into DNA.

Overall, the replication of DNA viruses involves the synthesis of complementary DNA strands using DNA polymerase, whereas RNA viruses replicate their RNA genome using different mechanisms.

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Independent genes are inherited according to the law of independent assortment, while Linked genes are inherirted together. Linked genes: 1) 3:1. 2) No. 3) AB, ab. Independent genes: 1) 9:3:3:1 2) Yes. 3) AB, Ab, aB, ab.

Independent assortment is a law that states that the alleles from two or more different genes distribute independently from each other in gametes.

A gamete receives an allele from a gene that does not depend on nor influence the allele of another gene in the same gamete. This can only be applied to independent genes.

These genes segregate independently after crossing over because they are located far away from each other.

Some other genes, however, are too close to each other and do not segregate independently. These are the linked genes, and they do not exhibit an independent distribution, and they inherit together more frequently.  

In the exposed example,

We will assume these genes express complete dominance.

Linked genes

1)

Parentals) AaBb  x  AaBb

Gametes) AB ab      AB  ab

Punnett square)         AB     ab

                      AB    AABB  AaBb

                       ab    AaBb  aabb

F1) 1/4 AABB + 2/4 AaBb  : 1/4 aabb

2/4 of the progeny is exprected to express the dominant traits, while 1/4 is expected to express the recessive traits.

Phenotypic ratio ⇒ 3:1

2)

No, the law of independent assortment does not apply

3)

Since the parents of these individuals are both true breeding, the gametes are AB and ab.

Independent genes

1)

Parentals)        AaBb        x         AaBb

Gametes) AB Ab aB  ab        AB Ab aB  ab

Punnett square)         AB        Ab          aB        ab

                      AB    AABB     AABb    AaBB    AaBb

                      Ab    AABb     AAbb     AaBb    Aabb

                      aB    AaBB      AaBb     aaBB    aaBb

                      ab    AaBb       Aabb     aaBb    aabb  

F1)

9/16 individuals are expected to express the two dominant traits, A-B-

3/16 individuals are expected to express one of the dominant traits, A-bb

3/16 individuals are expeected to express the other dominant trait, aaB-

1/16 individuals are expected to express the recessive trait, aabb

Phenotypic ratio ⇒ 9:3:3:1

2)

Yes, the law of independent assortment does not apply

3)

Since the parents of these individuals are both true breeding, the gametes are AB, Ab, aB, and ab.

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Answer:

When visible light strikes an object and a specific frequency becomes absorbed, that frequency of light will never make it to our eyes. Any visible light that strikes the object and becomes reflected or transmitted to our eyes will contribute to the color appearance of that object.

(1) Two characteristics of life that are possessed by viruses are:-

(i) genetic material

(ii) ability to mutate as well as evolve.

(2) Two features of life that are not present in viruses and which disqualifies them from being labeled as a living being are:-

(i) cellular organization

(ii) metabolism.

Viruses, like other living organisms, seem to possess genetic material which could be either RNA (ribonucleic acid) or DNA (deoxyribonucleic acid). However, both RNA as well as DNA cannot be present together in a virus. Viruses are nucleoproteins and infect their hosts through the genetic material. Viruses can also mutate and evolve just like other living organisms.

However, viruses do not have cells, which is the most basic feature of all life forms. Viruses also do not exhibit any metabolic activity.

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As a biologist, I would explain the origin of light fur in the mice on Santa Rosa Island by considering the process of natural selection.

The newly formed barrier island presented a new environment with different selective pressures compared to the mainland. The mice that successfully colonized the island were likely the ones that had genetic traits that allowed them to adapt to the new environment, including the color of their fur.

Over time, natural selection likely favored mice with lighter fur on Santa Rosa Island due to the unique environmental conditions. It's possible that the lighter fur provided better camouflage on the sandy beaches, allowing the mice to blend in with their surroundings and avoid predation. Alternatively, the lighter fur may have been better at reflecting the strong sunlight and keeping the mice cool in the hot, sunny environment.

It's important to note that the genetic diversity of the mainland population that colonized the island would have played a role in the development of the light fur trait. If there were already some mice with lighter fur in the population, they may have been more likely to survive and reproduce on the island, passing on the trait to future generations.

Overall, the origin of light fur in the mice on Santa Rosa Island can be explained by the process of natural selection and the unique environmental pressures on the newly formed barrier island.

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DNA is converted into RNA through a process called transcription. An enzyme known as RNA polymerase copies the DNA sequence into a messenger RNA (mRNA) molecule during transcription.

The information contained in a gene's DNA is transferred to a molecule comparable to DNA called RNA (ribonucleic acid) in the cell nucleus during transcription. Nucleotides are a series of building units that make up both RNA and DNA.

All live cells undergo transcription, the process by which genetic information moves from DNA to RNA and then to proteins. Despite the basic dogma's universality, there are significant differences in how information moves from DNA to proteins.

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This is an example of incomplete dominance. Incomplete dominance occurs when the phenotype of the offspring is a combination of the phenotypes of the parents and is not completely expressed.

Dominance is an evolutionary concept referring to the ability of one species to outcompete and outlive another species in a particular environment. It is essentially the concept of one species having a competitive advantage over another, usually based on physical or behavioural traits. Dominance is often seen in the animal kingdom, as some species are more successful in obtaining resources, finding mates, and surviving predators. In humans, dominance can manifest itself in various ways, such as having a higher social status, more wealth, or greater physical strength. In all cases, dominance is a result of natural selection and is an important factor in the evolution of species.

In this case, the individual's wavy hair phenotype is a combination of their parents' curly and straight hair phenotypes and is not completely expressed.

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Answer:

6.True

7.True

8.True

9. False, both RNA and DNA are nuclei acids. that are made from nucleotides

10. True

Explanation:

Answer:

6. False- light microspcopes

7. True

8. True

9. False- Nucleic Acids

10. True

True , horizontal analysis examines one item over many time periods, vertical analysis examines many items in the same interval of time.

Horizontal analysis denotes the advancement over period of time , while vertical analysis represents amounts as percentages from the base figure.

Horizontal analysis represents the many analysis over a period of time on the other hand vertical analysis represent one reporting at a time . Also horizontal line goes side by side and have 0 slope , while vertical lines goes up and down and have undefined slope .

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Answer:

It depends on the school you are going to...And if they don't give you any new biology textbook then it means that all you will be learning in grade 9 and 10 is already in the textbook which you will have to continue using.

Facts: