Answer:
Numerous examples of this human-induced contemporary evolution have been reported in a number of 'contexts', including hunting, harvesting, fishing, agriculture, medicine, climate change, pollution, eutrophication, urbanization, habitat fragmentation, biological invasions and emerging/disappearing diseases.
Explanation:
"What if speciation occurred in humans?" Your essay should give a clear and precise example of speciation.
A student is asked to write an essay over the hypothetic prompt above. While brainstorming, the student came up with
four different ideas for their essay. Which idea is BEST aligned with the writing prompt and instructions?
The term speciation refers to the process by which two or more different species are produced from a single original population by different speciation mechanisms. Speciation occurs in three main steps: separation of the original population, divergence (trophic divergence, reproductive divergence, genetic divergence, etcetera), and isolation.
The most related option to speciation is B. Two populations of humans living on separate sides of the ocean. After a catastrophic event, travel across the ocean is not possible. After millions of years of separation, the two groups are no longer able to produce viable offspring together, but can still produce within their isolated groups.
Speciation occurs when the original population is divided into two groups. They inhabit different places and are exposed to varying environmental conditions. With time, each group experience many genetic changes. These mutations depend on each group´s environment and its ecological pressures, and they accumulate in time. Pressures act on individuals and make them adapt to the new environmental conditions. Generation after generation, the genotype of individuals will increase the fitness to survive and reproduce. Fixation of mutations will increase the difference between the two groups, up to the diverging point into two new species. Even is they get together again, these species will not be able to mate and produce offspring, and if they do, the new generations will not be viable or fertile.
The exposed case of two human population living on different sides of the ocean, is an example of allopatric speciation.
Allopatric speciation refers to the geographic separation of a continuous genetic background, originating two or more new geographically isolated groups. During these events of speciation, emerging new barriers impede genetic flow between groups, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
Different stages are involved in the allopatric speciation process:
• The emergence of the barrier.
• Interruption in the genetic flow
• Slow and gradual differentiation due to the occurrence of mutations in each population and their accumulation in time.
• Genetic divergence by natural selection and reproductive isolation, impeding the two groups to mate even if the barrier disappears.
• Prezigotic isolation mechanisms favored by selection a secondary contact between the new species occurs.
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Answer:b
Explanation:
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how does a cow drink water
Answer:
cow will line up side by side and drink
Explanation:
They have to dip their mouth in without suck- ing air at the sides of their lips.ep 3
In an experiment, researchers find that certain neurons in the visual cortex preferentially fire in response to a bar of light that is oriented at a specific angle, and that different neurons similarly respond to bars of light oriented at different angles. This finding provides the strongest evidence for:
Answer:
Feature detection
Explanation:
Feature detection involves different neurons that are activated in response to specific stimuli. For example, feature detectors are activated in the cerebral cortex through visual stimuli of specific shapes or patterns. These neurons become more and more complex as the stimuli also become progressively more complex and specific. Featured detector neurons have been identified in the toad vision, where they have been involved in the toad's behavior in response to worm-like moving stimuli (e.g., orienting), and the bat auditory cortex, where they have been involved in the measurement of the distance between the bat and its prey.
A researcher is studying three wolf packs that hunt in the same area. The first pack preferentially kills mature, healthy moose; the second pack preferentially kills sick, old moose; and the third pack tends to kill an equal number of healthy and sick moose. Which pack likely plays the greatest role in determining the birth rate of the moose population
Answer:
The correct answer is - the pack that preferentially kills mature, healthy moose.
Explanation:
The birth rate is the number of individuals born in a population in a particular amount of time period. The birth rate can be determined by the individual born in a particular time period and that depends on how many healthy and viable individuals in a population can reproduce and produce new individuals.
Old and sicks are not the ones who can actively participate in reproduction and, however, if the number of healthy and mature individuals are killed there would be fewer newborns in the population.
Thus, the correct answer is the pack that preferentially kills mature, healthy moose.
What does the phosphorylation of Cdc25 by M-Cdk do? Question 4 options: It inactivates Cdc25, which promotes activation of more M-Cdk. It activates Cdc25, allowing the cell to exit mitosis. It activates Cdc25, which inactivates M-Cdk. It inactivates Cdc25, preventing further activation of M-Cdk. It activates Cdc25, which in turn activates more M-Cdk.
Answer:
It activates Cdc25, which in turn activates more M-Cdk
Explanation:
Cyclin are enzymes that regulate cell cycle progression by the activation of cyclin-dependent kinases (CDKs). These cyclins have no enzymatic activity on their own but they can activate Cdks by binding and phosphorylating them. CDKs can be activated by phosphorylation of activating sites and/or dephosphorylation of inactivation sites. Moreover, M-phase cyclins are cyclins that form M-CDK complexes in order to modulate the cell's entry into mitosis. Cdc25 is a phosphatase involved in the eukaryotic cell cycle which is well-known to regulate the entry into and progression during S (DNA Synthesis) phase and mitosis. In this regard, it has been shown that mitotic phosphorylation of Cdc25 by M-Cdks increases its intrinsic phosphatase activity, thereby Cdc25 is able to remove inhibitory phosphates from M-Cdk and, consequently, activate more M-Cdks.
Name the following.
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in humans.
(c) Tissue that transports food in plants.
(d) Tissue that stores fat in our body.
(e) Connective tissue with a fluid matrix.
(f) Tissue present in the brain
differentiate between kidneys and lungs
Kidneys are used to excrete urine and toxic wastes. They are very essential for keeping the body clean. Usually it excretes urea, sodium and some salts which are considered as waste in the body.
Lungs are used to breathe in and out air. It helps us to stay alive. We breathe in oxygen rich air and breathe out foul carbon dioxide air.
Find some applications of
nanotechnology in medical care and disease prevention.
Answer:
Preventing illnesses, more quickly diagnose, control diseases, treat diseases with fewer side effects, and create better medical aids such as more compatible prosthetics.
different between dominant character and recessive character
Dominant character:are always expressed when the connected allele is dominant,even if only one copy of the dominant trait exits.
Recessive character:are expressed only if both the connected allele are recessive.
Answer:
Dominant and recessive traits exist when a trait has two different forms at the gene level. The trait that first appears or is visibly expressed in the organism is called the dominant trait. The trait that is present at the gene level but is masked and does not show itself in the organism is called the recessive trait.
Explanation:
If some traits are absent or not expressed, but found in the parent, then the allele is said to be recessive.
Difference Between Recessive and Dominant Traits
DOMINANT
Dominant Trait Recessive Trait
Dominant allele is denoted by a capital letter
RECESSIVE
Recessive allele is denoted by a small letter
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Use the drop-down menus to complete the hypothesis of the first group of researchers. During a drought, the decrease in rainfall will reduce the amount of vegetation that can grow and increase the occurrence of natural fires, so an elevation in Select… and a reduction in Select… should be found in the cores.
Answer:
Microscopic charcoal, Vegetation.
Explanation:
As the researchers conducting research in the Nile region identified that an increase in temperatures leads to an increase in droughts and reduction of natural vegetation and thereby the chances of the occurrence of natural fires.Why are amphibians considered as unsuccessful land vertebrates
What are the pigments in cyanobacteria used for?
Answer:
Pigments are useful to plants and other autotrophs
Explanation:
Not sure, but hope this helped a bit
Which is more complex and less complex organism biosphere cell ecosystem
Answer:
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
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Kepler discovered that
have elliptical orbits.
moons
comets
planets
all of the above
Help please??
Answer:
all of the above
Explanation:
gravity makes a planet have a combination go straight yet go around the sun at the same time creating an ellipse
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How would a river that drains a watershed be affected if a portion of forest
uphill from the river was converted into a city with mostly impermeable
surfaces?
A. The river would decrease in size due to more runoff.
B. The river would increase in size due to more runoff.
C. The river would increase in size due to more rain seeping into the groundwater.
D. The river would decrease in size due to more rain seeping into the groundwater.
Answer:
d
Explanation:
d
what's the cell wall of a onion made up of?
Answer:
Unlike animal cells (such as cheek cells) the cell wall of an onion and other plants are made up of cellulose, which protects the cell and maintains its shape.
Answer:
cell membrane,cytoplasm,nucleus and a large Vacuole.
Explanation:
An onion is a multicellular(consisting of many cells)plant organism.As in all plant cells,the cell of an onion peel consists of a cell wall.
PLSSS HELLLPP- Which of the following measurements uses a derived unit? O volume O mass O length O time
Answer:
Volume
Explanation:
volume=length ×length ×length
The metric system is the system used for the measurement. It measures the mass, length, weight, time, etc. The unit of volume is a derived unit. Thus, option A is correct.
What is a derived unit?A derived unit is a unit used to measure and estimate the substance by using the basic or the fundamental metric unit system. It is based on units of the fundamental system.
The fundamental units include mass, temperature, time, luminous intensity, length, electric current, and amount of substance. On the other hand, derived units result from a combination of base units.
A volume is a derived unit as it came from the fundamental unit of length as,
Volume = length × length × length
= cm × cm × cm
= cm³
Therefore, option A. volume is a derived unit.
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A mutation occurred in the following DNA sequence AGCCTAGCC and the mutated form is now AGCCTTAGCC. Which of the following correctly describes the result of this mutation?
1.A deletion occurred so all of the amino acids added after the mutation may be wrong.
2.An insertion occurred so all of the amino acids added after the mutation may be wrong.
3.A substitution occurred so all of the amino acids added after the mutation will definitely be wrong.
4.An insertion occurred so all of the amino acids added after the mutation definitely will be different.
Answer:
Explanation:
1.A deletion mutation occurs when a wrinkle forms on the DNA template strand and subsequently causes a nucleotide to be omitted from the replicated strand.
2.This type of variant results in a shortened protein that may function improperly, be nonfunctional, or get broken down. An insertion changes the DNA sequence by adding one or more nucleotides to the gene.
3. A substitution mutation can cause the following: Change in the coding of amino acids codon to a particular stop codon resulting in an incomplete protein, which is usually non-functional. Can cause Silent mutations where a codon change can encode the same amino acid resulting in no changes in the protein synthesized.
4. when a premature nonsense or stop codon is introduced in the DNA sequence. When the mutated sequence is translated into a protein, the resulting protein is incomplete and shorter than normal. Consequently, most nonsense mutations result in nonfunctional proteins.
The Channel Islands are a series of small islands off the California coast. Each island has a genetically distinct population of foxes. Compare the population of foxes on one of these islands to the population of foxes in the forests of mainland California. Which is more likely to be impacted by genetic drift? Which is more likely to be at Hardy-Weinberg equilibrium?
Answer:
The fox population on the Islands experiences genetic drift whereas foxes in the forests has Hardy-Weinberg equilibrium.
Explanation:
The fox population on the Islands experiences genetic drift because there is no chance of introduction of different type of foxes in these Islands which experiences less variation in the population of already existing foxes. Genetic drift is the change that occur in the frequency of an existing gene allele in a population due to random sampling of organisms. Genetic drift may cause gene variants to disappear completely with the passage of time which leads to reduce genetic variation. The foxes that is located in the mainland forest experiences Hardy-Weinberg equilibrium.
Defining Populations
List three scales at which populations can be defined, from largest to smallest. Population groups
What is the end product of glycolysis ?
Answer:
pyruvate
Explanation:
Explanation:
The final product of glycolysis is pyruvate in aerobic settings and lactate in anaerobic conditions. Pyruvate enters the Krebs cycle for further energy production.
scientists who believe global warming is happening would agree with which of the following statements?
(A) There are few, if any, misconceptions about global warming
(B) Most scientists agree that global warming is occuring
(C) Human activity is a minor cause of global warming.
(D) There is little humans can do to stop global warming
Answer:
B. Most scientists agree that global warming is occurring.
Explanation:
There is a large deal of misconception in the public surrounding global warming. Human activity is the primary cause of global warming, and therefore, there are many actions that humans could take to stop global warming.
What are the functions of Amoeba Organs
Explanation:
The function of amoeba organs is nuclear.
In 1970, Frye and Edidin published research describing the mobility of plasma membrane proteins. They fused mouse and human cells together, creating a hybrid cell, and then examined the localization of mouse and human proteins over time. Initially mouse and human proteins were each restricted to one-half of the heterokaryon, but over time the mouse and human proteins mixed, with each being present over the entire cell surface. What technique did Frye and Edidin likely use to examine the mouse and human proteins
Answer:
The answer is "fluorescent microscopy".
Explanation:
A microscope featuring fluorescence is just the same as a conventional light microscope with additional features. Conventional microscopy employs visible light (400-700 nanometers) to illuminate and generate an enlarged image data. Scientists use this highly sensitive, precise, dependable, extensively to see the location of chemicals in tissues and macrophages in organs.
The purpose of Mendel's experiments with dihybrid crosses was to determine
whether:
A. an F2 generation could be produced from the Fi offspring.
B. one of two traits could be transformed by DNA.
O c. one trait would affect how another is inherited.
D. traits are controlled by more than one gene.
Answer:
C. one trait would affect how another is inherited
Explanation:
Based on his job duties, what kind of support services professional is Timothy? What type of skills are critical to Timothy's work?
Timothy is a support services professional at a large hospital. His job role requires him to sometimes work with law enforcement
personnel if a security threat situation arises.
Timothy is a _
A: transport technician
B: biomedical engineer
C: head of security
The general skills that Timothy needs most are
_ skills.
A: interpersonal
B: mathematical
C: reading
Answer:
1C: head of security
2A: interpersonal
Explanation:
Timothy is the head of security and its job requires him to work with law enforcement personnel if a security threat situation arises. Interpersonal skills are the type of skills are critical to Timothy's work. Interpersonal is relating to relationships or communication between people and we can say that this skill is important for the head of security to do his job efficiently and in a good manner.
Which of the following animals has a fetus ? A.Gobies B.antelope C.Tree frog D. Iguana
Answer:
the right answer is tree frog
Explanation:
define and describe osmosis
Answer:
Movement of a solvent (such as water) into a solution with a higher solvent concentration by means of a semi-permeable membrane (as from a live cell), which tends to equal solute concentrations in the membrane on both sides.
Explanation:
Osmosis, the spontaneous transition, distribution, or diffusion of water and other solvents over a semipermeable membrane. In 1877, a German physiologist, Wilhelm Pfeffer, researched the process, which is important in biology.
Osmosis is the passage of water down its concentration gradient, across a semi-permeable membrane. An everyday example is a plastic wrap in your kitchen: it allows air and water vapor to move across it, but no water or food. The membranes of cells are semi-permeable, too.
the pulmonary arteries have light violet blood why?
Answer:
The pulmonary arteries have light violet blood as an artistic depiction to stress they carry deoxygenated blood, or oxygen poor blood, from the heart to the lungs.
Explanation:
Which of the following is most efficient for mapping large areas of the ocean or the whole ocean floor? A. satellite imaging B. infrared imaging C. radio waves D. sonar
Answer
the answer is d. sonar
