Answer:
The correct answer would be non-disjunction.
Down syndrome refers to the genetic disease caused by the non-disjunction of chromosome number 21.
Non-disjunction refers to the event in which the homologous chromosomes or sister chromatids fail to separate properly during a cell division.
In Down syndrome, the sister chromatids of chromosome 21 fail to separate properly which results in the formation of a gamete with 2 copies of chromosome 21.
When this gamete fertilizes with another gamete, it results in the formation of a zygote with 47 chromosomes, that is, 46 chromosomes + extra copy of chromosome 21.
Answer:
The correct answer is nondisjunction.
Explanation:
The nondisjunction of the chromosome can be defined as the failure of separation of sister chromatid during meiosis. Due to the nondisjunction during the cell division, one daughter cells gets two chromosome and other daughter cell gets none of it. In case, the daughter cell having two chromosome is fertilized by a normal gamete it can result in trisomy.
In the case of Down Syndrome, the nondisjuction of the chromosome number 21 takes place.
HELP ASAP!!!
While an organism is alive, what happens to its C-14 to C-12 ratio?
^^^^^^^what he said^^^^^^^
What are some benefits of genetically engineered crops?
Choose one microscopic species that causes a human illness. Give the scientific name of the species, the disease it causes, and the vector, and then describe the symptoms in a 130 word paragraph or two.
Answer:
malaria or ebola
Explanation:
Why is the transfer of energy in a food chain usually only about 10 percent efficient?
The efficiency of energy transfer in a food chain is only about 10% due to the energy loss in the form of heat at each trophic level, which is a consequence of the second law of thermodynamics. As a result, after a limited number of energy transfers, there's not enough energy left to support another trophic level, limiting the length of food chains.
Explanation:The transfer of energy in a food chain is usually only about 10 percent efficient due to the second law of thermodynamics, which accounts for the loss of energy at each trophic level. This loss comes in the form of heat during the metabolic processes of organisms, such as respiration. An organism, for instance, only utilizes a small fraction of its consumed energy to do work or grow, with the majority lost as heat or stored as fat.
The concept of Trophic Level Transfer Efficiency (TLTE) serves to quantify this phenomenon. Taking the Silver Springs ecosystem as an example, the available energy from the primary producers (7,618 kcal/m²/yr) to the primary consumers resulted in the magnitude of 1,103 kcal/m²/yr, with the rest lost as heat or employed in respiration. Another related concept is the net primary productivity, which comprises the energy that remains in the primary producers after accounting for their individual energy requirements and heat loss.
Due to the successive energy losses at each trophic level, after a certain number of energy transfers, there is not enough energy remaining in the food chain to support another level. This principle explains the limited length of food chains in most ecosystems.
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85. (1) A ribozyme is a catalytic protein that assists in the processing of tRNA.
True
False
...?
Which of the following is an example of proper movement for a biceps curl?
Rotate the arm at the shoulder with the back straight
Bend the arm at the elbow with the back straight
Rotate the elbow and arch the back
Bend the elbow and move the upper arm forward
B. Bend the arm at the elbow with the back straight
Due to Mendel's law of segregation
A)homologous chromosomes pair up and cross over during prophase 1 of meiosis
B)alleles belonging to the same gene will never end up in the same gamete during mitosis
C)alleles belonging to the same gene will never end up in the same gamete during meiosis
D)genes located on non-homologous chromosomes sort independently of one another during the formation of gametes
Answer: The correct answer is C) Alleles belonging to the same gene will never end up in the same gamete during meiosis.
According to the Mendel's law of segregation, during the process of gamete formation in meiosis, the alleles ( different forms of a gene) are separated from one another so that every gamete receives one allele.
This is also called law of purity of gamete as alleles never end up in the same gamete during meiosis.
Thus, option C) is the right answer.
Mendel's law of segregation is "alleles belonging to the same gene will never end up in the same gamete during meiosis". Therefore, option B is correct.
Mendel's law of segregation states that during the formation of gametes (sex cells), the alleles (alternative forms of a gene) for each trait separate from each other and end up in different gametes. This ensures that each gamete receives only one copy of each gene.
When an organism produces gametes through meiosis, the two alleles for a particular gene separate or segregate, with one allele going into one gamete and the other allele going into a different gamete. This segregation allows for the inheritance of traits in a predictable manner and is one of the fundamental principles of Mendelian genetics. Thus, option B is correct.
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The chemical process by which your body breaks down food to release energy is called?
Energy flows in a food chain as one organism consumes another for food. What happens to this energy as it moves up the food chain from one level to the next?
Answer: IT DECREASES
Explanation:
A ___ nervous system is found in simpler animals like jellyfish.
which substance can enter a cell by diffusion without having to be digested
Which is larger 8.5 or 8.27?
Jane supplied plenty of water, minerals, sunlight, and carbon dioxide for her plant. But the plant still didn't do well. What might be the reason?
It may be too hot or cold for the plant.
The plant doesn't need water.
The plant doesn't need carbon dioxide.
Final answer:
The plant's poor performance, despite receiving adequate sunlight, water, minerals, and carbon dioxide, may be due to unsuitable temperature conditions. Plants have an optimum temperature range for growth, and temperatures too high or low can negatively affect photosynthesis and overall plant health.
Explanation:
Jane supplied plenty of water, minerals, sunlight, and carbon dioxide for her plant, but it still didn't do well. The reason might be the temperature conditions, either extreme heat or cold.
Plants require specific environmental conditions for optimal growth, including adequate sunlight, carbon dioxide, water, and minerals. They also need temperatures above freezing while actively growing and photosynthesizing. However, every plant has an optimum temperature range for growth, and deviating from this range can significantly affect their physiology and biochemistry. Too high temperatures can cause a water deficit stress leading to stomata closing, which limits CO₂ uptake and reduces photosynthesis. Conversely, temperatures below the optimum can slow down the metabolic processes essential for growth.
Additionally, other factors such as too much or too little water and incorrect light levels can influence plant health. Waterlogged soils, resulting from excess water, become anaerobic, harming root growth. Similarly, inadequate or excessive light affects photosynthesis, limiting growth. Thus, even if a plant is supplied with all necessary nutrients, unfavorable environmental conditions can prevent it from thriving.
In the diagram of the earths interior, where does the material that forms volcanos come from?
Using the same diagram, which part is the densest?
The answer would be A because it is the inner core of the earth.
20 POINTS
Cavendish bananas are a popular species among banana growers because they’re predictable. All of these bananas are grown to have the exact same genetic structure. How’s this possible?
They grow in the same ecosystem.
They are clones of the parent plant.
They get equal amounts of nutrients.
They grow during one time of the year.
They form from sexual reproduction.
Black and white coloration in cows is dominant to brown and white. Black and white cows were crossed over several years and the following progeny were produced: 8 black and white and 3 brown and white. What is the most probable genotype of each parent?
If we can treat "black and white" as a single allele that is dominant, let's call it B. "Brown and white" as a recessive single allele can be represented as genotype b. Because offspring were both brown and black, we know both parents must have a b allele, and at least one must have a B allele.
What is genotype ?
A genotype is the total set of heritable genes which is transferred from parents to offspring;
These genes involve in encoding specific features and the characteristics can be physically expressed in an organism called as phenotype.
In a complete Punnett square for two heterozygous parents, we get results of 25% homozygous dominant (BB), 50% heterozygous (Bb), and 25% homozygous recessive (bb). In terms of phenotype, 75% of offspring would be black and white, and 25% brown and white.
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Which is a potential negative consequence of using genetically engineered medicine?
A.Gene markers that are resistant to antibiotics are used, providing the possibility for humans to have increased antibiotic resistance.
B.Products that are used to genetically engineer medicine are poisonous.
C.Restriction enzymes are used to create the medicine and have been known to cause cancer.
D.Medicine that is created this way is less effective than medicine that is created the traditional way.
Answer:
A
Explanation:
the correct answer from the choices listed above is option A. A potential negative consequence of using genetically engineered medicine would be that gene markers that are resistant to antibiotics are used,
Gene markers that are resistant to antibiotics are used, providing the possibility for humans to have increased antibiotic resistance. The correct answer is a.
Explanation:The potential negative consequence of using genetically engineered medicine outlined in option A is a valid concern. In some cases, genetic engineering may involve the use of antibiotic resistance genes as markers during the development process. These genes help identify successfully modified cells. However, there is a risk that these antibiotic resistance genes could transfer to bacteria in the human body or the environment, contributing to the development of antibiotic-resistant strains.
This poses a significant public health concern as antibiotic resistance can compromise the effectiveness of antibiotics in treating bacterial infections, leading to more challenging and potentially life-threatening medical scenarios. Therefore, careful consideration and regulation are crucial in the development and use of genetically engineered medicines to mitigate potential negative consequences like increased antibiotic resistance.
Which of the following would differ if you compared the same reaction taking place with and without an enzyme? )
the chemical energy of the reactants
the chemical energy of the products
the energy required to start the reaction
the overall energy of the reaction
the response of plants to gravity is
which part of the electromagnetic spectrum do plants use for photosynthesis?
Using the chart, which of the following point mutations will cause the most harmful effect on an individual?
A. The sequence reads AUU; a change in the second base from U to C
B. The sequence reads CGA; a change in the first base from C to A
C. The sequence reads UGU; a change in the third base from U to A
D. The sequence reads UUA; a change in the first base from U to C and a change in the third base from A to G
The right answer is C. (non sens mutation are the most harmful)
In genetics, a nonsense mutation is a point mutation in which a nucleotide of a codon is changed, inducing the replacement of a codon encoding an amino acid (UGU, cystein) by a stop codon (UGA). The resulting protein, truncated and therefore incomplete (because the translation ends prematurely, and therefore we will have a truncated protein), is generally non-functional.
One criticism of the dsm that is noted by your authors is that it adheres to model, which means that a person is seen as either having a mental disorder, or not having a mental disorder. there is little or no allowance for "degrees" of a disorder.
Which of the following is an example of a nonpoint source of freshwater pollution?
pesticide runoff from farm fields
leaking toxic waste landfill
sewage treatment plant
factory waste piped into a stream
What does this activity tell you about the relationship between these six organisms?
Bird bat lizard frog cat whale
Final answer:
The activity concerning the comparison of a bird, bat, lizard, frog, cat, and whale is meant to illustrate their evolutionary relationships, using homologous structures and constructing cladograms to understand common ancestry.
Explanation:
The question relates to the concept of evolutionary relationships and common ancestry among organisms, which are key topics in biology. The organisms listed, namely a bird, bat, lizard, frog, cat, and whale, can all be compared in terms of their phylogenetic relatedness. Such comparisons often involve looking at homologous structures, which are anatomical features that are derived from a common ancestor but may have different functions, as is seen in bird wings and whale fins. Additionally, constructing a cladogram can help illustrate the evolutionary pathways and relationships between different species. By examining these aspects, it's possible to draw conclusions about how closely related these organisms are, and we can infer that mammals (such as bats, cats, and whales) share a more recent common ancestor with each other than with birds, lizards, and frogs which belong to different branches of the vertebrate tree of life.
What is the difference between decantation and extraction in lab? ...?
Final answer:
Decantation is the process of pouring off the top layer to separate it from the bottom layer, while extraction involves transferring a desired substance from one solvent to another based on differences in solubility.
Explanation:
Decantation and extraction are both separation techniques used in the laboratory.
Decantation is the process of carefully pouring off the top layer of a mixture to separate it from the bottom layer. This is often used when one of the substances in the mixture is denser than the other. For example, in a mixture of oil and water, decantation can be used to separate the oil, which floats on top, from the water.
Extraction involves transferring a desired substance from one solvent to another solvent, based on differences in solubility. This is typically done using a separatory funnel, where the two immiscible liquids are mixed together and then allowed to separate into layers. The desired substance will preferentially dissolve in one of the solvents, allowing it to be separated from the other components of the mixture.
Which data can best be represented by a line chart? rate of growth of a seedling over two weeks distribution of total monthly expenditure average annual yield of different processing plants in an industry NextReset
Answer:
A. Rate of growth of a seedling over two weeks.
Explanation:
A. Rate of growth of a seedling over two weeks.
How does fever indicate that your body immune system it's doing its job?
Based on the Plasmodium life cycle shown in Figure 21–4, what would happen if the mosquitoes disappeared?
A. Plasmodium merozoites would form, but gametes would not form.
B. The Plasmodium life cycle would continue, and humans would become the only host.
C. Plasmodium infection would continue because it will be passed from person to person.
D. The Plasmodium life cycle would be interrupted, and the infection could not be passed on.
The statement below refers to a structure of the cell.
Oxygen diffuses through this structure, but a sodium ion may need active transport.
Which structure is this statement most likely referring to?
A. A hydrogen pump
B. A permeable membrane
C. A cell wall
D. A semipermeable membrane
The structure in the given statement is certainly a semipermeable membrane. The correct option is D.
What is a semipermeable membrane?A semipermeable membrane is a hindrance that allows some molecules to pass while blocking the passage of others.
To transport any substance from outside to inside or vise-versa, it require use of energy using active passage.
Substances pass against its concentration gradient during active transport, from a low concentration area to a high concentration area.
This process is considered active because it necessitates the use of fuel basically in the form of ATP. It is the polar opposite of passive transportation.
Active transport is commonly associated with the accumulation of high concentrations of molecules required by the cell, such as ions, glucose, and amino acids.
Thus, the correct option is D.
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what organelles would be found in large numbers in a muscle cell