Answer: The answer is Mitosis
Explanation:
Đem giao phấn giữa hai cây bố mẹ đều TC thì được F1 xuất hiện một khiểu hình . Tiếp tục cho F1 tự giao phối với nhau thì thu được F2:
711 cây cao, quả đỏ
240 cây cao, quả xanh
238 cây thấp, quả đỏ
79 cây thấp, quả xanh
Biết mỗi cặp gen quy định một tính trạng. Biện luận quy luật di truyền đối với mỗi tính trạng, đối với cả hai tính trạng và lập sơ đồ lai từ P --> F2
Answer:
Đưa về tỉ lệ kiểu hình ta được:
F1 x F1 => F2:
\frac{711}{79}
cây cao, quả đỏ:
\frac{240}{79}
cây cao, quả xanh:
\frac{238}{79}
cây thấp, quả đỏ:
\frac{79}{79}
cây thấp, quả xanh.
Explanation:
<=> 9 cây cao, quả đỏ: 3 cây cao, quả xanh: 3 cây thấp, quả đỏ: 1 cây thấp, quả xanh.
Xét từng cặp tính trạng:
* Cặp tính trạng chiều cao:
Cao: Thấp = 3:1 => tính trạng thân cao trội hoàn toàn so với thân thấp.
* Cặp tính trạng màu sắc quả:
Đỏ: Xanh = 3:1 => tính trạng quả đỏ trội hoàn toàn so với quả xanh.
Qui ước gen:
A: thân cao a: thân thấp
B: quả đỏ b: quả xanh
Lấy tích cả 2 cặp tính trạng: (3 cao: 1 thấp)(3 đỏ: 1 xanh) = 9 cao, đỏ: 3 cao, xanh: 3 thấp, đỏ: 1 thấp, xanh => tỉ lệ bằng với tỉ lệ đề bài => 2 cặp gen qui định 2 cặp tính trạng di truyền theo qui luật phân li độc lập.
Suy ra kiểu gen:
- Ở cặp tính trạng chiều cao có tỉ lệ kiểu hình 3 thân cao: 1 thân thấp => bố mẹ F1 phải cho 2 giao tử và mang gen a.
=> F1 x F1 = Aa x Aa. (1)
- - Ở cặp tính trạng màu sắc quả có tỉ lệ kiểu hình 3 quả đỏ: 1 quả xanh => bố mẹ F1 phải cho 2 giao tử và mang gen b.
=> F1 x F1 = Bb x Bb (2).
Từ (1) và (2) => Bố mẹ F1 phải có kiểu gen AaBb x AaBb.
Vì đem lai 2 bố mẹ thuần chủng nên ta sẽ có 2 trường hợp.
Trường hợp 1:
P: AABB x aabb
G: AB ; ab
F1: 100% AaBb.
Trường hợp 2:
P: AAbb x aaBB
G: Ab ; aB
F1: 100% AaBb
Materials are
O the directions for living things
O what something is made out of
O a chart that we can use to determine what traits children will have
O things that grow quickly
Answer:
what something is made out of
What is the maximum number of electrons that can be held in the first electron energy level of an atom? In the second energy level?
Answer:
1st energy level - 2 electrons
2nd energy level - 8 electrons
Explanation:
Maximum number of electrons that a main energy level can occupy depends on type and number of sub energy levels.
s orbital can occupy 2 electrons. p orbital can occupy maximum 6 electrons.
1st energy level has only a single s orbital, thus can have upto 2 electrons.
2nd energy level has a s orbital and a p orbital. 2 +6 = 8 electrons
The maximum number of electrons that can be held in the first electron energy level of an atom is 2. The second energy level can hold 8 electrons.
This is because the first energy level can only hold s-orbitals, which can hold a maximum of 2 electrons. The second energy level can hold s-orbitals and p-orbitals, which can hold a maximum of 2 + 6 = 8 electrons.
The number of electrons that can be held in an energy level is determined by the Pauli exclusion principle, which states that no two electrons in an atom can have the same set of quantum numbers. The quantum numbers for an electron are:
n: The principal quantum number, which determines the energy level of the electron.
ℓ: The angular momentum quantum number, which determines the shape of the orbital.
mℓ: The magnetic quantum number, which determines the orientation of the orbital.
ms: The spin quantum number, which determines the spin of the electron.
The first energy level has a principal quantum number of 1, so it can only hold s-orbitals, which have an ℓ quantum number of 0. The second energy level has a principal quantum number of 2, so it can hold s-orbitals and p-orbitals, which have an ℓ quantum number of 0 and 1, respectively.
Therefore, the first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons.
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what is the difference between a knockout animal and a transgenic animal?
Explanation:
A knockout animal has definite inactivated of DNA
A transgenic animal usually has a unknown activated piece of DNA
The major difference between a knockout animal and a transgenic animal is that in a transgenic animal, a foreign gene is integrated into its genetic material, while in knockout animals, targeted genes either are rendered nonfunctional or are altered.
What do you mean by Transgenic animals?A transgenic animal may be defined as a living organism or cell in which its genome has been altered by the introduction of one or more foreign DNA sequences from another species by artificial means. These organisms are generated in the laboratory for research purposes.
When it comes to knockout animals, they are also generated in the laboratory for research purposes. But the mechanism of action is different here.
In these animals, their specific gene sequence is silenced or their function is terminated. They do not involve any insertion of foreign gene particles.
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1. Read this statement: Biotechnology uses chemicals exclusively for removing pharmaceuticals (medicines) from wastewater. Which part of the statement is not true?
Biotechnology uses chemicals in wastewater. Pharmaceuticals are found in wastewater. Medicines are removed from wastewater. Chemicals are used to break down waste.
2. Characteristics of temperate grasslands include which of the following?
High temperature and precipitation
Distinct seasons, low precipitation
Wet and dry seasons, high temperatures
High temperatures, low summer rainfall
Owing to low annual precipitation, there are few trees in the temperate grassland. There are distinct seasons in temperate grasslands.
Biotechnology refers to the use of living organisms to achieve various purposes. Living organisms have been used to synthesize biological molecules, carry out water treatment among others. Hence the statement; "chemicals are used to break down waste" is not in sync with biotechnology since microorganisms rather than chemicals are used to breakdown waste water in biotechnology.
Temperate grasslands experience distinct seasons and low precipitation throughout the year. Owing to this low annual precipitation, there are few trees in the temperate grassland.
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Answer:
for part 2 it's three
Explanation:
I took the test
Why do weather conditions change day to day
Explanation:
During the day, the air temperature increases as energy gains exceed the energy lost from Earth's surface
i dont understand how to work this out it dosent make any sense whatsoever
Explain the relationship between DNA, mRNA, and protein
Answer: In the first step, the information in DNA is transferred to a messenger RNA (mRNA) molecule by way of a process called transcription. ... The mRNA sequence is thus used as a template to assemble—in order—the chain of amino acids that form a protein. Figure 2: The amino acids specified by each mRNA codon. DNA is the genetic code that stores the instructions to make a protein. mRNA is involved in reading DNA, in a process known as transcription. This mRNA is then processed b ribosomes to make proteins. The sequence of DNA determines the codons in mRNA, which determines the sequence of amino acids, which determines the protein being made.
Explanation:
100 POINTS!!!!
How does matter and energy cycle through the living and nonliving parts of an ecosystem? In five sentences, please.
Matter and energy cycle through the living and nonliving parts of the ecosystem in the form of chemical compounds. Some chemical compounds make up living organisms that are called 'organic compounds'. Chemicals in the ecosystem are recycled. Some of the organic compounds of living organisms are returned to the ecosystem. Some of the organic compounds make up dead organisms. Some organic compounds are returned as nutrients to the ecosystem. Dead producers and consumers provide matter and energy to decomposers. Dead decomposers recycle dead matter, and the dead matter is returned to the ecosystem. All matter and energy are then returned to the ecosystem in one way or another. The matter and energy of the ecosystem can be recycled indefinitely because it is constantly being produced and consumed.
please please answer asap
A moose eats a lily pad. The food the moose eats is used to make ATP energy that can be used in cellular processes. The products of photosynthesis are the reactants of cellular
respiration. What is included in D in the diagram above? Choose ALL that apply.
A) water
B) oxygen glucose
D) sunlight
E) carbon dioxide
Answer:
oxygen and glucose
your welcome i hope this helps
Explanation:
Oxygen and glucose molecules are produced by the process of photosynthesis which are sent to the mitochondria for the synthesis of ATP. Thus, the correct option is B.
What are cellular processes?
Cellular processes are the processes which are essential for living. This includes all the processes which are carried out at the cellular level, but these processes are not necessarily restricted to a single cell.
Photosynthesis is the process of formation of carbohydrates in the plant cells by the use of sunlight and carbon dioxide. The products glucose and oxygen formed in this process are utilized in the process of cellular respiration.
Cellular respiration is the process of ATP synthesis from the glucose and oxygen produced from the photosynthesis.
Therefore, the correct option is B.
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Đặc điểm cấu tạo nào giúp xương to ra về bề ngang?
Answer:
el cuerpo humano necesita células para crecer para que pueda crecer por sí mismo. las células necesitan glucosa y oxígeno para crecer y sobrevivir
Explanation:
What % of oxygen comes from the ocean?
None
All
At least half
Rewatch
Submit
Which of the following is NOT one of the ways in which an invasive species affects an
environment?
O spreads disease
O increases biodiversity
O preys on native species
O alters food webs
Answer:it’s B increase biodiversity
Explanation: just take the test
Which color of star is likely to have the most thermal energy?
Blue colors dominate the visible light output of very hot stars (with much additional radiation in the ultraviolet). On the other hand, cool stars emit most of their visible light energy at red wavelengths (with more radiation coming off in the infrared).
Based on the data shown in the graph, which of the following best describes how ecologists could determine when this ecosystem is approaching a climax community?
A
Determine if the keystone species in the ecosystem is present two years after the volcanic eruption
B
Measure the biomass of the pioneer species present before and after the volcanic eruption
(C
Record the number and type of producers present every year after the eruption
D
Calculate the net primary productivity of a specific indicator species every year after the eruption
Scientists can tell that an ecosystem's climax is approaching when they record the number and type of producers present each year after the eruption, as shown in option C.
We can arrive at this answer because:
An ecological community reaches its climax when it reaches its last stage of ecological succession.At this stage, animals and plants are well developed and interact in a balanced way.Thus, the ecological region must have a considerably high number of producers, as it shows that the basis for interactions between living beings is well established.Thus, scientists must observe the number of producers that settle in each ecological succession, to be able to determine when the community is close to its climax.
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What is adaptive radiation? in your own words
Answer:
the diversification of a group of organisms into forms filling different ecological niches.
Explanation:
Help with whatever yk plzzzzz!!!!! ‼️‼️‼️‼️‼️
Answer:
Triglycerides are lipid compounds composed of a glycerol esterified to 3 fatty acid chains of varying length and composition.
fat molecules yield more energy than carbohydrates and are an important source of energy for the human body.
Explanation: this is all I know, hope it helps :)
True or false: A mutation is an alteration in the DNA sequence or content of a cell that is passed on when the cell divides.
Answer:true
Explanation:because before a cell is its own it must divide and that changes the dna/rna sequence so, ye its true if it isn’t right sorryyyyy.
if the thymus shrank and stopped making thymosins, we would expect to see an immediate decrease in the number of
hello :]
If the Thymus gland shrank, and stopped producing thymosin, what would happen is that we would loose a few of our "T" cells, which are detrimental to the immune system. Eventually, we can end up with too few T cells to protect ourselves – this is called immunodeficiency – or we can produce T cells that attack our own body – which is called autoimmunity.
How a fresh water/aquatic ecosystem can change into a land ecosystem over time. Support your explanation with evidence and include pictures.
If you answer correctly ill mark as brainliest!!
Answer:
i think this is the answer i also need to do this for my homework so i need to know if its correct
Explanation:
As the temperature increases the water starts to evaporate once the water evaporates there will be less water in lakes, rivers, and more. The more the temperature increases the more water evaporates so after it evaporates the aquatic ecosystem change to land ecosystem overtime. and may also cause fossils to be in land ecosystems such as in mountains and more
Lymphocytes are generated during an initial infection. Years later, these lymphocytes respond to repeated exposure to the infection. These lymphocytes are called ________ cells.
Adaptive immunity is developed after an organism is exposed to a disease. Lymphocytes, who years later respond to repeated exposure to the infection are called;
T CellsLymphocytes are basically classified into two namely, the B and T cells. The B cells give antibody-mediated immunity while the T cells provide cell-mediated immunity.
The memory cytotoxic T lymphocyte is stored as reserve in the body so that in the event of the reoccurrence of a disease, it will resolve itself into the cytotoxic T cell that will fight the disease antigen.
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Which sport below requires the least cardiovascular fitness?
A.
running
B.
weight training
C.
cross-country skiing
D.
swimming
Answer:
b is correct
Explanation:
The sport that requires the least cardiovascular fitness is weight training.
Option B is correct
What is cardiovascular fitness?Cardiovascular fitness is simply defined as an exercise that lasts longer periods, this test determines how well your body takes in oxygen and delivers it to your muscles and organs.
In conclusion, Cardiovascular fitness also relates to the heart.
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2. Protons have a ________ charge.
3. Neutrons have a ________ charge.
4. Electrons have a _______ charge
5. An atoms nucleus has a ________ charge.
6. The whole entire atom has a ______ charge .
7. An atoms atomic number is the number of ________________.
Answer:
2- Positive
3- Neutral
4- Negative
5- positive
6- neutral
7- protons
Hope I helped :)
True or False: Muscles can contract even when there is no visible movement.
Answer:
TRUE
Explanation: is correct
seizures affect the muscles and cause all or part of the body to go limp
Answer:
wow, ty for this information. I will try to remember this
What is adenosinetriphosphate?
Answer:
Adenosine triphosphate is an organic compound and hydrotrope that provides energy to drive many processes in living cells, such as muscle contraction, nerve impulse propagation, condensate dissolution, and chemical synthesis. It is also called ATP.
Explanation:
Answer: denosine triphosphate (ATP) is the source of energy for use and storage at the cellular level. The structure of ATP is a nucleoside triphosphate, consisting of a nitrogenous base (adenine), a ribose sugar, and three serially bonded phosphate groups.
Explanation:
how do multicellular organisms exchange gases
What is represented by the sequence below?
an immune response by cells of the pancreas
a feedback mechanism in multicellular organisms
differentiation of organic molecules
the disruption of cellular communication
its a feedback systame
An evil scientist’s evil lab assistant shoots you with a laser beam that erases all of the RNA in your cells, and removes your cells’ ability to create new RNA. Later on in the day, you trip and scrape your knee. Do you think that the scrape in your knee will ever heal? Why or why not.
Answer:
That scrape on our knee will never heal and the blood loss due to bleeding will never be replaced. This is because RNA is inside of cells and without the ability to create new RNA you cannot replace missing cells. So the scrape will never heal if your cells cannot create new RNA.
Explanation:
hope this helps. . . <3
Question 1
A) Skin cells(1 point)
have terminally differentiated.
become senescent quickly.
continually replicate.
become quiescent quickly.
.
Question 2
A) Which cell type undergoes terminal differentiation?(1 point)
hair cells
heart cells
stem cells
epithelial cells
Question 3
A) DNA replicates in the(1 point)
cell membrane.
endoplasmic reticulum.
cytoplasm.
nucleus.
Question 4
A) Which of the following might affect gene expression in a complex organism?(1 point)
the ability to reverse terminal differentiation
the number of chromosomes being copied
the types of cells near the site
the amount of time a cell takes to replicate DNA
Question 5
A) What replicates during mitosis?(1 point)
organelles
proteins
cytoplasm
cells
Answer:
1)become sediment quickly
2)heart cells
3)nucleus
4)the types of cells near the site
5)cells
Explanation:
I just took the test
As skin ages, it is subjected to a variety of internal stresses and external assaults, all of which can result in cellular damage. Thus, option B is correct.
What are the special properties of skin cells?Skin stem cells, which are multipotent adult stem cells that may self-renew and develop into many skin cell lineages, are present in adult skin.
Skin stem cells are active both during normal aging skin renewal and during wound healing. The body's barrier organ, the skin, is inherently vulnerable to a variety of stressors that affect its shape and functionality.
In response, cells are given a number of alternative chemical options, one of which involves senescence, a permanent cell-cycle arrest.
Senescent cells have been observed to accumulate with age and may play a role in diseases and changes to the skin that are brought on by aging.
Therefore, skin cells become senescent quickly.
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