Answer:
Crossing-over between homologous chromosomes (prophase 1), the random lining of homologous chromosomes (metaphase 1), and random fertilization are the mechanisms involved in genetic variation.
Explanation:
Crossing-over between homologous chromosomes (prophase 1), the random lining of homologous chromosomes (metaphase 1), and random fertilization are the mechanisms involved in genetic variation.
The Crossing-over events occur between two homologous chromosomes in the equatorial plane and make the daughter cells genetically different from the original one. The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants. After crossing over, homologous chromosomes get separated again.
On the equatorial plane, homologous paired together, randomly aline with their kinetochores facing opposite poles. The random arrangement of tetrads is different in every cell going through the meiosis process. There is no equal alinement between two cells. When tetrads aline in the equatorial plane, there is no predetermined order for each of the homologous chromosomes of each tetrad to face one of the poles and then migrate to it while separating. Chromosomes of the homologous pair arrange to face any of the poles to migrate forward to it. Each of the chromosomes has two possibilities for orientation at the plane. When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell. The order in the equatorial plane is what introduces variation into the gametes, being almost impossible for two gametes to have the same genetic charge.
Independent assortment occurs when the alleles from two or more different genes distribute in gametes independently from each other. In other words, 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. An organism gets only one of the members of the chromatids pair of each parent.
while looking at a graph, you notice a period of time where the line is perfectly horizontal what is most likely taking place during this time period
Answer:
The correct answer would be - the y-axis variable is constant.
Explanation:
In a normal line graph, there are generally two variables on two different axis one is at the x-axis and the other is on the y-axis that represents the correlation between these two variables. If there is a change in the variable present on the x-axis the change on the variable on the y-axis establishes the relationship among these variables.
If there is a period on the graph where the line is completely horizontal it means the variable present on Y-axis has no change during this period or is constant. Suppose a graph is plotted between speed or velocity on the Y-axis. A perfectly horizontal line on this graph means that speed is not changing over time and remain at te same speed.
How is gamete different from other type of cells in a persons body?
A. It has four times the number of chromosomes
B. It has no chromosomes
C. It has twice the number of chromosomes
D. It has half the number of chromosomes
(I’ll give points + brainalist for the correct answer)
Answer:
d
Explanation:
it has half the chromosomes
What is the difference between convergent plate boundaries that have plates of the same density to convergent plate boundaries with plates of different densities.
Answer: If they have the same density, they will be pushed up together creating a mountain. If the plates have different density then the one with more density overlaps the other.
Explanation:science
You have identified a new, recessively inherited trait in dogs: floppy ears. To determine if the gene for Floppy Ears is X-linked or not, you should:
Answer:
Cross a non-floppy-eared male to a floppy-eared female and observe if males offspring have the floppy ear trait
Explanation:
Mammals (e.g. dogs) have two sex chromosomes: X and Y. In the XY sex-determination system, the female gamete (i.e., the ovum) contributes to an X chromosome, while the male gamete (i.e., the sperm) contributes either an X chromosome or a Y chromosome: normal females are XX and normal males are XY. In consequence, a male always inherits its X chromosome from the mother and its Y chromosome from the father. In this case, the presence of the floppy ear trait in all males F1 offspring obtained by crossing a non-floppy-eared male to a floppy-eared female indicates that this trait is linked to the X chromosome because males inherit the floppy ear trait from the mother.
When an animal exhales, it releases carbon into the atmosphere. What is another way in which an animal is part of the carbon
cycle?
OA. When an animal sweats, it releases carbon back into the atmosphere through the process of transpiration.
OB. When an animal dies, bacteria release carbon in the body during the process of decomposition.
Oc. When an animal burrows in the ground, it absorbs carbon from the soil.
OD
When an animal urinates, it transmits carbon monoxide to water in the water cycle.
Answer:
Passing carbon from one organism to the next
When an animal eats a plant, carbon from the plant becomes part of the fats and proteins in the animal. Decomposers and some animals, called detrivores , feed on waste material from animals, and the remains of dead animals and plants.
Explanation:
names of five natural things from the word grid given below
AS T R PILM
o w LS PR P 0
RO AM
MS O LILIN
ART OTWAN
MIT
THE
IN
0
01
OTA NIMA
NA 0 OM
Q
RIO
R
LISI N
Answer:
AIR
SEA
ANIMAL
PLANT
MONTH
Explanation:
These are the least I could get
How can you tell from a food web which organisms will have the greatest biomass?
Answer:
How can you tell from a food web which organisms will have the greatest biomass?
The tropic level contains the greatest biomass in most ecosystems is producers. This occurs because producers get their energy from the sun, the sun is the most available resource, so there are the most at that level.
Explanation:
I hope that this answer has helped you to more thoroughly understand your question asked. If you have any further questions, please do not hesitate to ask them below.
Have a great rest of your day/night!
suggest why a glass tank with water was placed
Answer:
The two layers of glass provides protection from the heat of the lamp, and the water level moves down rapidly as the gas is collected.
This is the Answer for your question :3
I hope you are having a great day ❤️❤️❤️
Please help this is science
[tex]\sf\purple{23}[/tex] (No. of chromosome pairs) x 2 = [tex]\sf\red{46}[/tex] (No. of chromosomes) ✅
................................................MORE:-Humans have 23 pairs of chromosomes, for a total of 46 chromosomes.The two types of chromosomes are:-[tex]\sf\blue{Autosomes}[/tex] - There are 22 pairs of autosomes in humans. [tex]\sf\pink{Gonosomes\:or\:sex\:chromosomes}[/tex] - They are X and Y chromosomes. In the case of males, they have one X and one Y chromosome, while females possesses two X chromosomes...................................................[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]
3.1
Suggest which leaf carries out more photosynthesis and explain why.
Explanation:
Leaf that are really green, because they contain Lots of chlorophyll in the chloroplast which is the main site for photosynthesis
Word Bank: brain, instincts, interpreted, organs, reflexes, spinal cord, senses Notes
The central nervous system includes the _______ and _______.
Signals from _______ and the body's _______ are received by the brain and the spinal cord.
Once signals are processed and _______ by the central nervous system, a response is sent back to the body.
A central nervous system is also responsible for programming _______ and _______.
Answer:
The central nervous system includes the nerves and pressure points
Signals from and the body's movements are received by the brain and the spinal cord.
Once signals are processed and _______ by the central nervous system, a response is sent back to the body.
A central nervous system is also responsible for programming _______ and _______.
Explanation:
Read this passage about CFTR mutations. Then, using your knowledge of cells, select the section that describes mutations that occur at the ribosome.
The CFTR gene was first discovered in 1989, but as with many research endeavors, that was only the first step. Since that first discovery, scientists have identified 1,700 mutations of the CFTR gene. These various mutations are classified according to their specific effect on the CFTR protein. Some mutations interfere with the protein assembly process. These are called protein production mutations and result in construction of incomplete or unstable proteins. Once built, the CFTR protein folds itself into a stable three-dimensional tube shape and travels to the cell membrane where it inserts itself as a channel between the cell’s interior and its surface. Mutations that affect this part of the process are called protein processing mutations. Each channel has a gate that opens and closes in response to chemical signals. Gating mutations cause misinterpretation of those chemical signals. Conduction mutations change the inside of the tunnel, making passage through the channel slower and more difficult.
Mitosis is the process through which a cell replicates its DNA and produces two identical daughter cells. If a cell undergoing mitosis is currently in anaphase as shown in the diagram below,
The duplicated genetic information found in a parent cell's nucleus is divided into two identical daughter cells during the fourth stage of mitosis, referred to as anaphase. Thus, option B is correct.
What mitosis process through which cell replicates its DNA?The sister chromatids are able to separate because the protein “glue” holding them together is degraded. Each chromosome now exists on its own. The opposing ends of the cell are drawn to the chromosomal pairs in each pair.
The replication fork is connected to a number of proteins that aid in the The way DNA polymerase creates new strands is mostly by include nucleotides that complete each (template) strand. The S-stage of interphase is when DNA replication happens.
Therefore, Sister chromatids split from one another and are drawn to the opposite ends of the cell during anaphase.
Learn more about mitosis here:
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If Walter waters his plants daily, then his plants will grow. Walter's plants are not growing. Thus, we can conclude Walter has not been watering his plants. Is this an example of inductive or deductive reasoning
Answer:
The correct answer is - deductive reasoning
Explanation:
Deduction reasoning is a general reasoning process that starts from a basic or general thought or idea and then a conclusion is based upon that idea. These ideas are presumed to be true and known. It is a deductive argument that based on known premises and conclusions would be specified.
Inductive reasoning provides specific cases to more general, but not necessarily true, conclusions. In the given question the ideas or premises are more specific and perceived to be true and the conclusion is specific thus, it is a deductive reasoning.
What genetic and other changes might have caused these cells to escape normal cell cycle regulation these cells are hela cancer cells
Answer:
Cancer cells such as Hela cells escape to normal cell cycle by mutations that lead to the misexpression and/or overexpression of regulatory molecules (e.g., cyclins and cyclin-dependent kinases) and faulty checkpoint control of the cell cycle
Explanation:
The term cell cycle refers to the mechanism of DNA replication and cell division, which involves a series of sequential steps. The control of the cell cycle depends on 1-cyclins and cyclin-dependent kinases (CDKs) that regulate the cell cycle by a cascade of protein phosphorylations and 2- a group of checkpoint controls that monitor the completion of critical cellular events. HeLa is an immortalized cell line derived from cervical cancer cells. These cells (HeLa) contain 76 to 80 total chromosomes (instead of the 46 chromosomes that contain normal-diploid body cells), some of which are heavily mutated. These mutations can affect CDKs that control the cell cycle as well as checkpoint-control mechanisms (for example, those resulting from DNA damage), thereby cells do not enter programmed cell death (apoptosis) and proliferate uncontrollably.
A. Somalia B. Kenya C. Spain D. Nigeria
Answer:
Somalia
Explanation:
what is adaptive radiation
Answer:
Adaptive radiation is the process where organisms diversify rapidly from an ancestral species to a multitude of different, new forms. More particularly when a change in the environment makes new resources available.
BRAINLIEST FOR BEST ANSWER
1.Astronomers have made great strides in sending probes out to other planets and moons in our solar system. If they were to find a living creature some place other than Earth, how could DNA analysis help them better understand the organism? Explain in 1–2 sentences.(2 points)
Unlike many plants, the stomata of the water lilies are found on the upper surface of the leaves. Suggest a possible reason for this adaptation.
Answer:
All plants need stomata on the surfaces of their leaves for photosynthesis. ... The stomata of water lilies are on the upper surface of their leaves, maximizing air exposure. Stomata on the underside of the leaves would be wasteful because water contact interferes with the exchange of carbon dioxide and oxygen.
mark me brainliestt :))
Answer:
Because the upper surface of the water lillies are not immersed in water.
Explanation:
Since the stomata is an opening for water to be excreted, the water lillies (which are usually found in water) need a surface which is not in contact with water so as the release the water as a metabolic waste. And since the lower surface of the water lilly's surface is immersed in water, there will be no point to excrete the water.
Reproductive system
Explain How does a fetus get nourishment up
until the time it is born?
Answer:
The fetus gets it's nourishment through the umbilical cord that is connected to the mother's uterus
Bony Fish (bass etc.) and marine mammals (like dolphins) evolved some similar adaptations for survival in aquatic environments. However, they evolved separately and are not closely related evolutionarily. What type of evolution does this represent?
Answer:
Convergent evolution
Explanation:
Convergent evolution is a type of evolution of similar features and/or structures between organisms that are not phylogenetically related. This type of evolution is known to create analogous structures/organs that exhibit similar or the same functions but were not present in the last common ancestor of these taxa. An example of analogous structures (and therefore also of convergent evolution) are the wings of bats and of insects (e.g., butterflies). Conversely, divergent evolution is a type of evolution where species phylogenetically related, i.e., species that share a common ancestor, evolve and accumulate differences over time.
what is a strategy? and how can you apply it to every day life
Answer:
Plan. Once you have the information, you can make a plan.
Experiment. The whole point of being strategic is to always find better ways to do stuff – in less time and for maximum productivity.
Think. That should be done at every step of the process, all the time.
Track.
Explanation:
hope this helps you
explain why a source of nitrogen is added to the fermenter
Nitrogen is essential to yeast growth and yeast metabolism. In winemaking, YAN plays a key role at two different levels: It represents an important nutritional factor for yeasts during alcoholic fermentation due to its function in protein synthesis and sugar transport.
MacConkey Agar contains crystal violet which binds to gram positive bacteria, preventing them from growing. The media turns yellow in response to the production of acid when lactose is fermented. Which two terms best describe this media
Answer:
The media describes Selective and Differential.
Explanation:
Given - MacConkey Agar contains crystal violet which binds to gram positive bacteria, preventing them from growing. The media turns yellow in response to the production of acid when lactose is fermented.
To find - Which two terms best describe this media ?
Proof -
The media describes Selective and Differential.
Reason -
MacConkey is a selective and differential media.
This media is used to selectively isolate gram-negative bacteria from other bacteria and differentiate them on the basis of lactose fermentation.
Lactose fermenters turn red or pink on MacConkey agar, and non-fermenters do not change color.
1. Catalytic converters reduce which of the following pairs of pollutants in car exhaust? a.)Carbon dioxide and ozone
b.)Carbon monoxide and hydrocarbons
c.)Carbon dioxide and particulates
d.) Lead and mercury
e.)Methane and particulates
Answer: B
Explanation: By most estimates, catalytic converters fitted inside the exhaust pipe of a gasoline-operated car convert over 90% of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) from the engine into less harmful carbon dioxide (CO2), nitrogen and water vapour.
The catalytic converter used in the exhaust of the cars reduces carbon mono oxide and hydrocarbons.
What is a catalytic converter?The catalytic converters are the devices used in the exhaust of the vehicles run on petrol and diesel.
They convert the harmful toxic gases into the less harmful pollutants by a redox reaction.
By most estimates, catalytic converters fitted inside the exhaust pipe of a gasoline-operated car convert over 90% of hydrocarbons (HC).
carbon monoxide (CO) and nitrogen oxides (NOx) from the engine into less harmful carbon dioxide (CO2), nitrogen, and water vapor.
Thus the catalytic converter used in the exhaust of the cars reduces carbon mono oxide and hydrocarbons.
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1c) If the amino acid sequences in the proteins of 2 organisms are similar, why will their DNA also be similar?
Answer and Explanation:
Because the DNA sequence determines a protein's amino acid sequence, a gene shared by two closely related organisms should have similar, or even identical, amino acid sequences. That's because closely related species most likely diverged from one another fairly recently in the evolutionary span. Thus, they haven't had as much time to accumulate random mutations in their genetic codes.
Strong contrasts in texture have what effect on a monochromatic design?
Answer:
It prevents monotony
Explanation:
Strong contrasts in texture have a primary effect on monochromatic design by ensuring it’s more eye catching and not too plain.
Contrasts is a term used to describe the display of an objects dissimilar sides. A monochromatic light is known to have just one color and the strong contrasting texture however makes it possible for it to have different color differences thereby preventing monotony.
As a population grows past the ecosystem's ______ the size of the population will _____ until the size of the population stabilizes at a constant level
Answer:
carrying capacity , increase
Explanation:
Up to the the population carrying capacity the the population will increase to give a perfect balance and when the population will be much then the population will decrease.
A vaccine used against an infectious disease may contain??
Answer:
antigens
Explanation:
a vaccine may contain that
Why does glucose more soluble in water comparing to benzoic acid?
Thanks :)
Answer:
because it dissolves in water very well
Explanation: