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Answer:

Explanation:

Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.

The reduction is accomplished by 2 divisions after the duplication of chromosomes

- first division: separation of homologous pairs of chromosomes (this reduces the total in half)

- second division: separation of sister chromatids of a chromosome.

The rearrangement in meiosis occurs by crossing over/genetic recombination.

This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation

An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.

This condition produces offsprings that have some characteristic facial features, short stature etc

Rearrangement takes place at the time of meiosis with the lining of chromosomes pair during the metaphase 1 and 2. Down syndrome is the example of chromosomal abnormality.

• A process in which a single cell differentiates two times to generate four cells comprising half the original amount of genetic information is termed as meiosis.

• During meiosis, the process of rearrangement takes place when the chromosomes line up in pairs at the time of metaphase 1 and 2. Then in anaphase 1 and 2, the separation of these chromosomes takes place and each gamete gets one of each kind of chromosome.  

• One of the examples of chromosomal abnormality is Down syndrome, which is, illustrated by the third copy of chromosome 21. The phenotypic variability, which takes place during Down syndrome is muscle hypotonia at the time of birth, and cognitive impairment.  

Thus, during meiosis reduction and rearrangement of chromosomes takes place, and one of the chromosomal abnormality is the Down syndrome.

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Answer:

Hey there!

The correct answer would be B. Background extinctions are a normal part of stable ecosystems.

Hope this helps :)

Explanation:

Igneous rock is formed through the cooling and solidification of magma or lava.

Answer:Igneous rock is which is also called magmatic rock is the rock formed when hot,molten rocks crystallizes and solidifies.

Explanation:

Answer:

C. thymine

Explanation:

Adenine pairs with thymine in DNA and pairs with uracil in RNA.

Hope it helps.

Answer:

Pluto and comets

Explanation:

The two objects in space formed from the huge disk of ice and debris beyond the outer planets are Comets and Pluto.

A Comets is made of dusty ice and they are known to orbit the sun. Comets are also known to contain gases such as carbon dioxide, water, methane and ammonia. Pluto is the farthest planet away from the sun. It also contains ice and some amount of dust which validates the chosen option.

Basedon astronomical findings, the two objects in space formed from the huge disk of ice and debris beyond the outer planets are Comets and Pluto.

Comets are objects found in space which are composed of dust and ice.

Comets are known to orbit around the sun.

Comets are composed of gases such as carbon dioxide, water, methane and ammonia.

Pluto which once was classified a planet is known to be farthest planet from the sun.

Pluto is composed of ice and dust particles.

Therefore, the two objects in space formed from the huge disk of ice and debris beyond the outer planets are Comets and Pluto.

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Answer:

A, B, O

Explanation:

Hope this helped, brainly bot keeps on deleting my answer for the article I read this on.

Answer:

D. All of the living things that interact within a forest ecosystem

Explanation:

A biological community consists of all biotic(living) organisms within an ecosystem.

Answer:

The clarity of the lake water isn’t specified so assuming the clarity improved and other predatorial fish were able to target stickleback fish more easily the full body plating had to come into play to make it more difficult for them to be preyed upon and to give them a better chance at escape.

Explanation:

The clarity of the lake water though not specified in this context. The full

body plate will help the stickleback fish to escape from its predators.

Water clarity is defined as the amount of light which is able to penetrate into

water bodies thereby making it easier for animals in it to see and hunt

properly for their food.

The improvement in water clarity will give the predatorial fish  an advantage

to easily hunt stickleback fish. The  full body plate trait will therefore give it a

form of adaptation to enable ity escape from other predators in the water

body.

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Answer:

they open up to get the energy from the sun.

Explanation:

Answer:

Answer:

Explanation: FERTILIZER :

1) It may be artificial or natural substance.

2)These are chemicals that are added to the soil to increase its fertility and productivity.

3) They are costly

MANURE:

1) It is a natural substance

2) These are obtained by dead and decaying plants and animals.

Prepared in factories.

3) They are less costive then Fertilizer.

Answer:

D

Explanation:

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Answer:

The purpose of technology is solving problems.The entire process of problem solving involves gathering and analysing data.

Explanation:

I hope this will help you:)

Answer:

The correct option is;

Land and oceans

Explanation:

Divergent boundaries otherwise known as a constructive boundary is a feature that is liner in shape and occur between the spreading centers of two separating tectonic plates where also magma rising from the mantle forms a new crust

Rifts are formed in continents (land)by divergent boundaries which enlarge into rift valleys. Active divergent boundaries can be located in mid-ocean ridge tectonic plate and volcanic islands are formed by divergent boundaries.

Answer:A

Explanation:

Answer:

Precipitation

Explanation:

Precipitation refers to the falling of the condensed form of water vapor as a result of gravity. The given excerpt presents the process of precipitation of Nitrogen along with the water vapor. The nitrogen gets mixed along with the water vapor and returns to the soil. This process of returning after passing through the process of condensation is termed to be precipitation.

Answer:

C) Faults form in the lithosphere.

Explanation:

Faults form in lithosphere is part of transform boundaries because the plates simply slide past each other without causing any change to the lithosphere (i.e it is neither created nor destroyed) which is why transform boundaries are also sometimes referenced when we speak about phenomena related to when plates slide in opposite directions.

Answer: c. Faults form in the lithosphere.

Explanation:

           Cells             Functions

Muscle cells :  Help move the skeleton; help the heart beat and pump blood

Neurons :        conduct electrical impulses; allow body to react to stimuli

Epithelial cells : Regulate exchange of chemicals, secrete various substances

Blood cells :      oxygen throughout the body,  protect against pathogens

The cells in the human body have specialized functions and some of the specialized function of some of the specialized cells present in the human body are as listed above.

The muscle cells helps with the mobility of the body and also allows the heart to beat successfully while the Neurons of the nervous system transmits electrical impulses to the brain for proper reaction.

Hence we can conclude that the specialized cells and their functions are as listed above.

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Answer:

Diffusion

Explanation:

The concept of diffusion states that molecules like to travel from areas of high concentration to low concentration.

Let's think about an example. Let's say you are having a party at your house and in one room there is 100 people and in the other room connected to it, there is only 10 people. What do you think is going to happen as time passes? Right, people are going to move to the room where there is less people so as to equally disperse themselves across the area. The same thing happens within our body with ions and gases.

Ions can diffuse into or out of cells based off their concentration gradients. If there are too many ions on one side, they will simply move to the other side. There are different types of diffusion. Passive diffusion and facilitated diffusion, but those are for a different conversation.

Answer: all of the answers should be correct

Explanation:

- there is mostly oxygen in the atmosphere although there are many other types f gasses such as methane and carbon dioxide

- the water cycle requires the atmosphere as a part therefore recycling water

- the layer protects us from very harmful uv rays that can cause cancer to the skin

- the rest are self explanatory

Answer:

1 False. It is made mostly of Nitrogen

2 True  It does recycle water

3 True.  It does protect the earth from harmful radiation

4 True. It does reduce the temperature extremes between day and night

5 True. It recycles Carbon dioxide and oxygen

Explanation:

I had this on my quiz

For number 2: It is a part of recycling water, so if this is wrong then oof

WARNING: I haven't finished my quiz so ill let you know when im done/ and what the results are:)

Answer:

d. All of the these.

Explanation:

Hope it helps.

Answer:

Explanation:

Current procedural terminology(CPT) are medical codes used for medical procedures, billing and payment. The code is formulated by America doctors and its serves as guide for treatment.

Diagnosis code for treatment of Retina is 67113, H33.031, W21.03XA

Procedures

The first is to check of CPT codes for repair of eye with Repair/ Retina/ Detachment using Vitrectomy and the code 67113 for rectina repair will be referred to.

Code 67113 is used for repair of damage to retina.

Another index is checks called the ICD-10-CM using Detachment/retina/with retinal/break/giant and code H33.031 will be referred to where 1 indicate right eye as place of injury.

The last code is ICD-10-CM and it is used to locate external Causes of Injuries using Struck (accidentally) by/ball (hit) (thrown)/baseball. Code W21.03 will be referred to as the guide for procedures.

Answer:

Granulosa cells                          

Explanation:

Foliculogenesis is a dynamic and complex process through which the follicle goes through many stages of development in a short period (approximately 60 days in humans and some chimpanzees).

The stages classification is based on morphological changes such as follicular size or diameter, the number of follicular cell layers, etcetera. These classifications might vary among authors but could be denominated as:

Through each stage, there are certain modifications in the oocyte, follicular cells, and connective tissue. As the oocyte grows, the follicular cells might reach a size twice or three times bigger than the ones of the primordial follicles. Their shape also changes and they adopt an aspect of stratified epithelium. Their cytoplasm gets a granulous aspect, after what these cells receive the name of granulous cells. The De Graaf follicle characterizes for having a space named follicular antro that displaces the oocyte to one of the sides.    

The oocyte at this point gets surrounded by zona pellucida and corona radiata .    

The follicular antro (The highlighted structure) separates the oocyte from the externally located granulosa cells or follicular cells.    

Answer:

C. 1:4 children will be albino.

Explanation:

Hope it helps.

During interphase the cells copies it’s DNA. In the pictures it shows a chromatid duplicating into a sister chromatids.

The interphase is the period when the cell is in a non-dividing state and this can be in different stages: the first gap (G1) between the last mitosis and the S phase (phase of DNA synthesis) and the second gap (G2) between the completion of the S phase and the next mitosis (M).

Moreover, interphase is the portion of the cell cycle that is not accompanied by visible changes under the microscope, and includes the G1, S and G2 phases. During interphase, the cell grows, replicates its DNA and prepares for mitosis.

A cell spends most of its time in what is called interphase, and during this time it grows, replicates its chromosomes, and prepares for cell division. The cell then leaves interphase, undergoes mitosis, and completes its division.

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Answer:

B. The dog would not have any energy left for activity

Explanation:

A dog paddles across a lake, and if the hydrogen ion pumps in its mitochondria stopped functioning, then the dog would not have any energy left for activity, which is present in option B.

When a dog paddles in a lake, it requires energy, and the mitochondria are considered the powerhouse of the cell as they produce ATP by creating the hydrogen ion gradient across the inner cell membrane of the mitochondria. If the hydrogen ion pump fails, ATP and energy are not produced, and the dog is unable to paddle in the lake. The energy is created due to the gradient, and later, the hydrogen ions enter the matrix through the ATP synthase.

Hence, A dog paddles across a lake, and if the hydrogen ion pumps in its mitochondria stopped functioning, then the dog would not have any energy left for activity, which is present in option B.

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The answer you are looking for is B.If fertilized by a sperm cell that contains a Y chromosome the individual will suffer from Klinefelter syndrome. If fertilized by a sperm cell that contains an X chromosome the individual will suffer from triplo X syndrome.Both heterosomal aneuploidies.

The following choice would be a sex chromosome aneuploidy in a human is that a sperm has one X chromosome. Option A is correct.

Sex chromosome aneuploidy is a condition in which a person has an abnormal number of sex chromosomes. The normal number of sex chromosomes in a human is 46, with 23 chromosomes in each sex cell. Females have two X chromosomes in their sex cells, while males have one X chromosome and one Y chromosome in their sex cells.

A sperm with one X chromosome is an example of a sex chromosome aneuploidy because it has one fewer X chromosome than the normal number. This condition is called Turner syndrome, and it is characterized by short stature, underdeveloped ovaries, and other physical abnormalities.

The other answer choices are not examples of sex chromosome aneuploidy because they do not involve an abnormal number of sex chromosomes. Option A is correct.

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Answer:

The correct option is Genetic drift greatly affects small populations, but large populations can recover.

Explanation:

Genetic drift is an evolutionary mechanism in which the allelic frequencies in a population change through many generations. Its effects are harder in a small-sized population.  

Genetic drift results in some alleles loss, even those that are beneficial for the population, and the fixation of some other alleles by an increase in their frequencies. The final consequence is to randomly attach one of the alleles.  

Genetic drift has important effects on a population when this last one reduces its size dramatically because of a disaster -bottleneck effect- or because of a population split -founder effect-.

In the exposed example, the hurricane caused a disaster in both populations, reducing the number of individuals on the island and in the mainland. Henry saw a decrease in genetic variation in the island species, but not in the mainland species. This could be because the island population was smaller than the mainland population, so it was more affected by the disaster. The loss of some alleles in the population caused a decrease in genetic variation in the island population.

Answer:

The answer is B.

Explanation:

The bottom two answers don't make sense and the first one is unrelated.

Answer:

Neuroblastoma is a cancer that develops from immature nerve cells.

Explanation:

Neuroblastoma often spreads to the bone marrow (the soft inner parts of certain bones)

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Answer:

Neuroblastoma often spreads to the bone marrow (the soft inner parts of certain bones). If blood or urine levels of catecholamines are increased,

Explanation:

then finding cancer cells in a bone marrow sample is enough to diagnose neuroblastoma (without getting a biopsy of the main tumor

Answer:

Este es un ejemplo de dominancia incompleta. Es una ocurrencia genética que ocurre cuando un gen dominante no expresa su manifestación completa en el alelo recesivo en un alelo dominante heterocigoto.

Por lo tanto, ambos rasgos se manifiestan, lo que resulta en la combinación de los dos alelos para los colores (blanco y rojo). Se dice que el alelo rojo dominante exhibe un dominio parcial sobre el alelo blanco recesivo, y esto da como resultado el alelo completamente rosado.

De acuerdo con la ley mendeliana, las dos flores rojas son heterocigóticas. Por lo tanto, las flores rojas heterocigóticas dominantes deben ser R. El alelo blanco es recesivo (rr) enmascarado por el rojo R,

Sin embargo, cuando se cruzan los dos alelos heterocigotos rojos:

Los fenotipos están en forma de

RR, (1) rojo Rr Rr (2) rosa rr (1) Blanco.

Esto ocurre porque el alelo rojo dominante no era total / completamente dominante en el alelo recesivo blanco en cada uno, lo que da como resultado un alelo rosa (el tercer fenotipo)

This is an example of incomplete dominance.It is a genetic occurrence  which occurs when a dominant gene does not express it full manifestation on the recessive allele in an heterozygote dominant allele.

Therefore,both traits are manifested which results in the blend of the two allele for colors(white and red).The dominant red allele is said to exhibit partial dominance over the recessive white allele.And this results in the entirely pink allele.

Based on Mendelian law the  two red flowers are  heterozygotes .Therefore, Red heterozygote dominant flowers should beRr.The white allele is recessive(rr) masked by the R-red,

However,when the two red heterozygote alleles are crossed:

The phenotypes are in the form of  

RR,(1) red  Rr Rr(2) pink  rr(1)White.

This occurs because, the dominant red allele was not fully/completely  dominant on the  white recessive allele in each,which results in pink allele(The third phenotype)

Explanation:

The branch of science which deals with living beings is called biology.

The language of the question is different so it is difficult to answer it.

According to the data given in the question, they are discussing incomplete dominance because the ratio is 1:2:1.

The cross in which the dominant parent is not able to show its character and does not able to suppress the recessive gene. In this case, the plants show the character of somewhere in between both of the cases.

Therefore, they get the ratio of 1:2:1 which indicates the phenotype of red: pink: white.

Hence, the correct answer is incomplete dominance.

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