Down's syndrome occurs because of a(n)



missing sex chromosome



extra sex chromosome



additional 21st chromosome



additional 18th chromosome

Answers

Answer 1

Answer:

C.Additional 21st chromosome

Explanation:

Hope this helped :)


Related Questions

mention the 7 groups of Baitmore classification of viruses​

Answers

Answer:

Structure of some viruses classified by Baltimore group: HSV (group I), HCV (group IV), DENV (group IV), IAV (group V), and HIV-1 (group VI) HIV-2(group VII)

Based on your knowledge of the cell structures of living things, what is one reason viruses are not considered alive?
A.They lack cell walls
B.they lack nuclei
C.they lack chroroplast
D.they lack cell membranes​

Answers

Answer:

What does it mean to be 'alive'? At a basic level, viruses are proteins and genetic material that survive and replicate within their environment, inside another life form. In the absence of their host, viruses are unable to replicate and many are unable to survive for long in the extracellular environment.

Answer:

B

Explanation:

The nuclei is basically like the heart of a cell.

The magic word is:


A) Ostoma


B) cristae


C) chemiosmosis


D) chromosome


E) aneuploidy


F) gene


G) meristem


H) zygote

Answers

Please give more information, I can help if I know what it’s going for :)

Explanation:

Dear questioner;

Paddington's Answer is B)Cristae he see in his book

Hope it helps I'm a Paddington lover

What is the important of ecological factors to organisms

Answers

Explanation:

The ecological factors that affect the growth of plants and determine the nature of plant communities are divided into three types.

The three types of ecological factors are: (1) Climatic factors which include rainfall, atmospheric humidity, wind, atmospheric gases, temperature and light (2) Physiographic factors which include altitude, effect of steepness and sunlight on vegetation and direction of slopes (3) Biotic factors which include interrelationship between different plants of a particular area, interrelationship between plants and animals occupying the same area and interrelationship between soil microorganisms and plants.

I. Climatic Factors:

The important climatic factors of a region are rainfall, atmospheric humidity, wind, temperature, and light. Of these climatic factors each one individually contributes to the general and overall effect of climate by influencing the life processes of plants which constitute the vegetation.

answer in a paragraph

During interphase, how does a cell prepare for division? Describe cell division, including the processes of mitosis and cytokinesis. Be sure to describe the mitotic steps.​

Answers

Answer: Interphase is the phase in the cell cycle during which cells that will undergo mitosis prepare for division. In interphase, DNA of the cell copies. After that cell undergoes mitosis, which is the phase of the cell cycle during which cell divides on two identical. Mitosis consists of four phases:

1. Prophase: Chromatin in the nucleus condenses and chromosomes pair up

2. Metaphase: Chromosomes line up at the centre of the cell.

3. Anaphase: The sister chromatids separate from each other to the opposite sides of the cells.

4. Telophase and Cytokinesis: Membrane forms around each set of chromosomes on two opposite sides of the cells and cell divides into two identical daughter cells.

Can someone help cause i only have 10 mins thank you

Answers

Answer:

All cells come from pre-existing cells

Explanation:

planets and moons shine in the sky due to reflected sunlight TRUE or FALSE
NO SITES PLEASE

Answers

Answer:

its true but internet should tell you that in a short amount of time

what evidence supports Hess's theory of seafloor spreading?

Answers

Answer:

Evidence of Sea Floor Spreading Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.

Explanation:

(winks and runs off)

can someone answer it! ​

Answers

The answer is because: What is meant by Na+ channel inactivation? The Na+ channel no longer allows Na+ ions to pass through it. What happens when voltage-gated K+ channels open? ... minimum voltage needed to generate an action potential.

Axons insulated by a(n) _____ are able to conduct impulses faster that those not so insulated.

Answers

Answer:

Much like the insulation around the wires in electrical systems, glial cells form a membraneous sheath surrounding axons called myelin, thereby insulating the axon. This myelination, as it is called, can greatly increase the speed of signals transmitted between neurons (known as action potentials).

Explanation:

for more pls visit

https://www.nature.com/scitable/topicpage/myelin-a-specialized-membrane-for-cell-communication-14367205/

When scientists refer to the DNA to RNA to proteins pathway, the RNA part really represents three differenttypes of RNA: messenger RNA (mRNA), transfer RNA (tRNA), and ribosome RNA (rRNA). How is each type of RNA important to protein production? ( Will Mark Brainliest and please only answer if your company 100% sure. And Do Not Repost Someone Else's Answer that is on Brainly Or Any Other Websites Please.​

Answers

Answer:

mRNA carries information for protein synthesis.

tRNA carry amino acids to the ribosome.

RNA is responsible for the ribosome's catalytic function associated with protein synthesis.

Capturing gas emitted from landfills results in a(n) _____________ of CO2 production.

Question 3 options:

a)

increase


b)

decrease


c)

balance

Answers

Answer:

b. decrease

Explanation:

that's only my answer but by thinking the capturing gas emitted from landfills results in decrease of CO2 production.

What effect does viscosity have on blood flow?

A.) Low blood viscosity leads to slower blood flow.

B.) High blood viscosity leads to slower blood flow.

C.) Low blood viscosity increases resistance and leads to fast blood flow.

D.) High blood viscosity decreases resistance and leads to fast blood flow.

Answers

Answer:

B

Explanation:

High blood viscosity leads to slower blood flow. Therefore, option B is correct.

What is viscosity?

Viscosity is a measure of a fluid's resistance to flow. It describes the internal friction between different layers of fluid as they move relative to one another. In general, fluids with high viscosity flow more slowly than fluids with low viscosity.

Viscosity can affect blood flow by altering the resistance to blood flow in blood vessels. Blood viscosity is influenced by the thickness and stickiness of blood, which is determined by the concentration of various proteins and cells in the blood.

When blood viscosity is high, the blood is thicker and flows more slowly, which can increase the resistance to blood flow in blood vessels. Therefore, option B is correct.

Learn more about viscosity, here:

https://brainly.com/question/30577668

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Hemolysis is:

O A) when a red blood cell is in a hypertonic solution and the cell ruptures

O B) when a red blood cell is in a hypotonic solution and the cell ruptures

O C) when a red blood cell is in a hypotonic solution and the cell shrinks

O D) when a red blood cell is in a hypertonic solution and the cell shrinks

Answers

A) When a red blood cell is in a hypertonic solution and the cell ruptures

If a brown-eyed mother and a blue-eyed father have four children, three will probably have brown eyes. What can you conclude from this? *

A. Brown eyes are a successive trait
B. Brown eyes are a submissive trait
C. Brown eyes are a recessive trait
D. Brown eyes are a dominant trait

Answers

The answer to this would be D

Which type of cells are being displayed?

Answers

Where are the cells ?

Spiritual wellness is to posses a set of guiding beliefs, principles, or values that give meaning and purpose to your life.
A.
True
B.
False

Answers

Answer:

A

Explanation:

Its true

Answer is A give the guy above brainiest he’s correct

through which material would you expect sound waves to move fastest

Answers

Answer:

Solids

Explanation:

Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.

Help anyone numbers 1-16 I am not asking for all just some or even one thank you

Answers

anyways 1. dominant allele, 2. gene, 3.genetics 4. genotype, 5. recessive allele,10. cross pollination 12. probability.

which describes fat?
A. a lipid that stores energy
B. a nucleic acid that directs cell function
C. a protein that speeds up a chemical reaction
D. a carbohydrate that produces energy​

Answers

A lipid is fatty acids which falls under fat , and lipids store energy hence A being the answer

Answer:

The answer is A

Explanation:

a lipid that stores energy

The trapezius is a(n) _____ to the pectoralis major.

Answers

Answer:

complement

Explanation:

The trapezius is a complement to the pectoralis major.

What is Trapezius?

The trapezius may be characterized as one of the widest and most superficial muscles that are located in the upper back and trunk region. It is triangular in structure, wide, and thin that encircles the upper back of the shoulders and neck.

While the pectoralis major is the most superior and largest muscle that is located within the region of the anterior chest wall. This muscle is thick, fan-shaped in appearance positioned beneath the breast tissue, and constructs the anterior wall of the axilla.

Both of these muscle types complement each other in every aspect such as location, structure, appearance, etc.

Therefore, The trapezius is a complement to the pectoralis major.

To learn more about Pectoralis major, refer to the link:

https://brainly.com/question/14695328

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As more and more people exist on Earth, which of the following will
DECLINE?
5 points
The amount of construction materials required on a yearly basis
The amount of solar energy that is retained in the troposphere and in the atmosphere
as a whole.
The area available to wildlife and other animals.
The use of energy needed to sustain communication and residential needs.

Answers

Answer:

the area available to wildlife and other animals

Explanation:

makes sense

Why don't people's cells starve from lack of glucose while they are fasting​

Answers

Answer:


Fasting can definitely raise blood glucose. This is due to the effect of insulin falling and the rising counter-regulatory hormones including increased sympathetic tone, noradrenaline, cortisol and growth hormone, in addition to glucagon. These all have the effect of pushing glucose from liver storage into the blood. This is normal. If you are not eating, you want to use some stored glucose. The question is this – if you are not eating, and your blood glucose went up, where did that glucose come from? It can only have come from your own body (liver). So, it’s a natural phenomenon, and the fasting now allows your body to use some of the glucose for energy.


ASTRONOMY NEED HELP FASTTTT


Which law states that when an object gets smaller, the velocity of its spin increases
proportionally to its size?

Answers

Answer:

casue it's lighter

Explanation:

What is the function of the cell membrane? The cell membrane controls what goes into the cell (food) and what leaves the cell (waste). The cell membrane protects the cell from damage. The cell membrane controls the amount of water that goes into the cell and stores it there if it doesn't rain. The cell membrane allows air to enter, but won't allow water to enter into the cell.

Answers

Answer:

Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly

Explanation:

How does cytokinesis in plant cells differ from cytokinesis in animal cells?



animal cells form a cell plate



plant cells form a cell plate



plant cells go through the process in reverse



plant cells go through two rounds of cytokinesis while animal cells just do once

Answers

Answer:

During cytokinesis in animal cells, a ring of actin filaments forms at the metaphase plate. The ring contracts, forming a cleavage furrow, which divides the cell in two. In plant cells, Golgi vesicles coalesce at the former metaphase plate, forming a phragmoplast.

which involves transport proteins?
A. Osmosis
B. Diffusion
C. Active transport
D. Passive Transport ​

Answers

Answer:

C

Explanation:

help!
Which description is not a property of an acid?

Sour taste
Slimy Feel
dissolve metals
corrosive

brainliest will be possible!! ​

Answers

Answer:

Slimy feel, you can know this because citric acid or Lemmon juice

Explanation:

How does golgi apparatus and lysosomes work together

Answers

Answer:

A lysosome is basically a specialized vesicle that holds a variety of enzymes. ... Those proteins are packaged in a vesicle and sent to the Golgi apparatus. The Golgi then does its final work to create the digestive enzymes and pinches off a small, very specific vesicle. That vesicle is a lysosome.

1. Observe: Look through the descriptions of the large and small organs. A. Which of the large
organs allow nutrients and water to pass through their walls

Answers

Answer:

The small intestine and large intestine

Explanation:

The small and large intestines were designed to allow nutrients to pass through their walls.

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The angle of elevation of the top of a cliff from the point Q on the ground is 30. On moving a distance of 20m towards the foot of the cliff the angle of elevation increases to x. If the height of the cliff is 17.3 m, thenfind xo the blood pressure in the systemic arteries is greatest during Which one is correct? Obsessed girl or obsessive girl Which of the following is the best description of a convention that Egyptian artists used in funerary sculptures?Figures were accurate likenesses of the real people.Figures had extremely accurate body proportions.Figures had compact forms with few projecting parts. describe the effect that dehydration would have on the specific gravity of urine and why Marta is a teenager who doesn't eat fruits and vegetables. Her diet consists primarily of chicken, cottage cheese, yogurt, white bread, and butter. Furthermore, she doesn't take dietary supplements. Based on this information, Marta has a high risk of ________. Question 9 of 15What effect is created by the use of three-point perspective?A. Objects look as though they are rotated to the side.B. Objects look as though they are being seen at eye level.C. Objects look as though they are being seen from above or below.D. Objects look as though they are far away.SUBMIT Does anyone have any suggestions on ways I could get better on grammar? Which value is a solution of the inequalityx5+ 2 6? 52 1.5yIf you could do this asap ty why would someone need to find the relative density of an object? Find the equation of the line through (8,1) which is perpendicular to the line y=x/26.Give your answer in the form y=mx+b. Please help and no links;) 25. Which one of the following epithelial tissues lines blood capillaries?A. Cuboidal tissue5. WhighB. Squamous tissueC. Columnar tissueD. Glandular tissue which structure is named for how high up it is? taj mahal acropolis colosseum pantheon Please help Fraction yes or no Is f(x)=x^3-x symmetric about the origin What is the value of this expression?29(1335) Suppose that u =8,2 and v =5,5. What is the angle between u and v , rounded to the nearest degree? Please make it original. Write a 3-4 paragraph analysis of the character Rainsford from The Most Dangerous Game. Please make it original