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
Edema is defined as a collection of fluid in an area of the body. What is the physiological change that causes edema
If a purple-flowered plant is crossed with a white-flowered plant, and 37% of the offspring have white flowers, then the genotype of the purple-flowered parent plant is:
Answer:
The difference between genotype and phenotype is that phenotype is the physical appearance of a trait and genotype is the genetic constitution underlying a trait.
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
Photosynthesis is a build up process that ensures the production of the by-products glucose and oxygen from carbon-dioxide and water in the presence of sunlight.
Since the products of photosynthesis are the reactants of cellular respiration, D would include oxygen, glucose and ATP (option B).
In cellular respiration in the mitochondrion from the diagram, glucose and oxygen is required and here also, the ATP derived from photosynthesis is also depleted in cellular respiration. As cellular respiration requires oxygen to give out carbon-dioxide and water.Learn more about cellular respiration: https://brainly.com/question/866852
Answer:
A) Oxygen and B) Glucose
Explanation:
Photosynthesis uses carbon dioxide and water to create oxygen and glucose, therefore we can eliminate E and A, since they aren't products of photosynthesis, they are only components that help in production. Since water and carbon dioxide create oxygen and glucose, that means that oxygen and glucose are both products of photosynthesis. We could also eliminate D, because sunlight is a part of photosynthesis, however plants do not produce sunlight, they only take in in. This leaves us with only A and B as our remaining answer choices, since we already know that the products of photosynthesis are the reactants of cellular respiration.
Can someone please help me
Molecules diffuse down a concentration gradient.
O True
O False
Explanation:
True
Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes "down the concentration gradient". The end result is an equal concentration, or equilibrium, of molecules on both sides of the membrane. At equilibrium, movement of molecules does not stop
The ischial ____________________ of the pelvis are also called the "sits bones" because they are the structures you would feel if you fell on your but
Answer:
the rest of the question is:
The ischial ______________ of the pelvis are also called the "sits bones" because they are the structures you would feel if you fell on your but from a great height. In people with little body fat, pressure between these bony projections and a seat cause soreness
- condyles
- epicondyles
- spines
- trochanters
- tuberosities
THE ANSWER IS E: TUBEROSITIES
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
how can you prove that arteries and veins in the heart function differently when compared to the rest of the body?
Answer:
Explanation:
Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
Answer:
Arteries are thicker and stretchier to be able to handle the higher pressure of blood moving through them. Veins are thinner and less stretchy. This structure helps veins move higher amounts of blood over a longer time than arteries.
Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
1. which type of bond is formed between a metal and a nonmetal?
2. what type of bond is formed between 2 nonmetals?
3. what is the criss-cross method?
4. how are inoic compounds named?
5. how are covalent compounds named?
6. name the following compounds:
i. NaCl
ii. CO
iii. Na2S
iv. BN
7. write the formulas for the following compounds:
i. Iron(III) Phosphide
ii. Calcium Bromide
iii. Hydrogen Dioxide
iv. Chlorine Pentafluoride
v. Strotium Oxide
Answer:
Explanation:
1. Ionic bonds
2. Covalent
3. Basically you switch the subscripts around
4. Write the name of the cation, then the anion. Add proper suffix
5. Write the name of the element and the prefix. Add proper suffix
6.
i. Sodium Chloride
ii. carbon monoxide
iii. sodium sulfide
iv. boron nitride
7.
i. FeP
ii. CaBr2
iii. HO2
iv. ClF5
v. SrO
how do multicellular organisms exchange gases
Use the passage and the illustrations to directly answer questions 1-5 on the other side. Then you will apply the information to other successions in-order to answer questions 6-10.
The water level of Lake Michigan was once 18 meters higher than it is today. As the water level fell, land was exposed. Many small lakes or ponds were left behind where there were depressions in the land. Below are illustrations and descriptions of four ponds as they exist today.
Pond A: Cattails, bulrushes, and water lilies grow in the pond. These plants have their roots in the bottom of the pond, but they can reach above the surface of the water. This pond is an ideal habitat for the animals that must climb to the surface for oxygen. Aquatic insect larvae (food for larger insects, which in turn are food for crayfish, frogs, salamanders, and turtles) are abundant.
Pond B: Plankton growth is rich enough to support animals that entered when the pond was connected to the lake. Fish make nests on the sandy bottom. Mussels crawl over the bottom.
Pond C: Decayed bodies of plants and animals form a layer of humus over the bottom of the pond. Chara, branching green algae, covers the humus. Fish that build nests on the bare bottom have been replaced by those that lay their eggs on the Chara.
Pond D: The pond is so filled with vegetation that there are no longer any large areas of open water. Instead, the pond is filled with grasses. The water dries up during the summer months.
Questions:
Succession 1 – Drying of a Pond
1. Write the letters of the ponds in order from the youngest, to the oldest.
2. As the ponds undergo succession, what is happening to the type and number of organisms?
3. Black bass and bluegill make their nests on sandy bottoms. In which pond would you find them?
4. What will happen to the black bass and blue gill as the floor of the ponds fills with organic debris?
Answer:
1- BCAD
2- They grow and diversify
3-B
4-C
5- They will die
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:
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
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.
Select all of the mechanisms that could have resulted in the evolution of various combinations of exons, giving rise to different genes.
Check All That Apply
exon loss
exon duplication
5' capping
mutations in the splicing mechanism
DNA mutations
tRNA shuffling
Given what we know about the mechanisms surrounding human DNA, we can confirm that the ones that may result in the evolution of various combinations of exons are:
Exon lossExon duplicationMutations in the splicing mechanismsDNA mutations.An exon is a segment of DNA that carries information for the formation of specific proteins, whereas an Intron, its counterpart, applies to the segments that do not carry information or code for any proteins.
Given its nature of carrying genetic information, the loss or duplication of exons can lead to various combinations of these. Exons are arranged in specific segments of the genetic code, the loss of one can cause the interaction of Exons that were not previously related, the same may happen with duplication.
Splicing is the mechanism by which introns are removed from DNA. Since introns do not code for anything, they can be removed without harm and the exons can be arranged to form mature messenger RNA. A mutation of this mechanism can cause Exons to be arranged in new formations.
Finally, much like the Splicing mechanism, mutations in the DNA can cause the recombination of exons by affecting the genetic code of the exons themselves.
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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
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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place the nucleotides in the correct order to create a complimentary strand of dna
ATG CTG ACC TAG
1) ATC
2)GAC
3)TGG
4)TAC
Answer:
ATG=TAC
CTG=GAC
ACC=TGG
TAG=ATC
Explanation:
I took the quiz
The carrier(s) for high energy electrons during glycolysis is/are _____.
A. FADH2, ADP, NADH, & NADPH.
B. only NADH.
C. FADH2, ADP, & NADH.
The answer is C! Hope this helped, and good luck!
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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How are healthy ecosystems able to maintain balance between the different organisms that live within it?
Answer:
A well-balanced ecosystem functions via the cycling of energy and materials. The sun is the most important source of energy for ecosystems. The photosynthesis of sunlight by plants results in the production of oxygen as a waste product, which is then used by animals in the process of respiration. Animals, on the other hand, generate carbon dioxide as waste, which is then used by plants.
Explanation:
Hope it helps:)
In which process is rapid reproduction an advantage?
Explanation:
In fact many simple organisms benefit from rapid asexual reproduction in order to maintain a stable populations. They may not be as able to change or adapt to new threats, but can certainly out produce them. Or create enough offspring that beneficial mutations are bound to occur.
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.
Describe the function of sensory neurons. What do sensory neurons do in your body?
Answer:
Answer in explanation.
Explanation:
Sensory neurons are nerve cells that are triggered by sensory input from your surroundings. Let's say you touch a hot object with your fingers. This causes sensory neurons to activate and transmit messages to the rest of the nervous system about what they've discovered (which is that the object is hot).
I hope I was able to help!
What does meiosis typically result in the production of?
Answer:
Meiosis results in the production of gametes (sex cells)
i dont understand how to work this out it dosent make any sense whatsoever
HELP FAST ! People donate bone marrow so that those in need can produce:
O bones and fat
O fat and muscles
O blood and fat
O bones
Answer:
blood and fat
Explanation:
if it's for the Connexus test, I just did it and the correct answer is blood and fat.
Through the bloodstream of the patient, these given cells travel to the bones. The new blood-forming cells will be created here using the donor cells. Thus, option C is correct.
What is bone morrow donation?The patient does not experience a lot of pain during the treatment. After the anesthetic goes off, the donor can feel pain. Painkillers can be required for the upcoming days.
Collagen, which is rich in bone marrow, helps to maintain and strengthen the skin and bones. The donor is infused into the patient's bloodstream during a transplant.
It is also high in glucosamine, a substance that prevents osteoarthritis, eases joint pain, and lowers joint inflammation.
Therefore, people donate bone marrow so that those in need can produce blood and fat.
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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
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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