It is possible to determine whether the allele for curled ears is dominant or recessive by performing a test cross. It is fundamental for breeders because desired traits show differential patterns of inheritance.
In a diploid (2n) organism, a given gene locus exhibit two different variants or forms called 'alleles'.
An individual is homo-zygous when both alleles for a given gene locus are the same, while an individual is heterozygous when alleles are different.
In cases of complete dominance, the expression of the recessive allele is completely masked in heterozygous individuals.
A breeder is a professional who performs genetic crosses between different organisms in order to obtain offspring (eg., plants, animals, etc) with desired phenotypic features.
A test cross is a type of cross that breeders use to determine whether an allele is dominant or recessive (in this case, the allele for curled ears).
In a test cross, the organism that is a carrier of the unidentified allele is crossed with another organism that is believed to be homo-zygous for the recessive trait, and then the proportion of offspring is examined.
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Which of the following statements is true about interacting with people from different cultures? O a) Most people within a culture think and act the same. O b) It's important to treat people from different cultures as individuals. Oc) Some cultures are better than other cultures. Generalizations and stereotypes don't impact people's perceptions of cultures.
Answer:
I hope it helps you
I think b is the answer
Bacteria break down the nitrates and release oxygen. True or false? Short answer
Answer:
True
Short Answer-Denitrifying bacteria transform nitrate in extremely wet soils and swampy grounds where there is very little oxygen, i.e. the conditions are anaerobic. The bacteria get the oxygen they need for respiration from the breakdown of nitrates.
Explanation:
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In Gregor Mendel's work with pea plants, he found that when a tall pea plant, with genes TT, was crossed with a short pea plant, with genes tt, that _____ % of the first generation of offspring plants were _____.
Answer:
In Gregor Mendel's work with pea plants, he found that when a tall pea plant, with genes TT, was crossed with a short pea plant, with genes tt, that _100_ % of the first generation of offspring plants were tall pea plant_.
Explanation:
After crossing the two types of plants, Mendel observed that among the F1 there were only tall variants, while the other variant (short) disappeared. Mendel named "dominant" the expressed variant. Mendel then let these new plants auto pollinate and observed the results in the second generation, F2. He saw that the short variant that had previously disappeared, reappeared again. Both tall and short plants were present in the F2. Mendel named "recessive" the second alternative variant.
Mendel explained his results by arguing that discrete factors were responsible for these phenotypes. These factors should have been present in the F1 in pairs. One of them came from one parental plant, and the other factor came from the other plant. These factors then separated again when sex cells were produced, giving two types of gametes, each with only one factor.
Mendel concluded that each plant had a pair of factors -which he named alleles-, and that each factor coded for one trait -tall and short-. He thought that these factors -T and t- separate -segregate- during gamete formation. This conclusion is known as the segregation principle (First Mendels´ Low).
What is the relationship between coronary artery disease and a heart attack?
A. Coronary artery disease is a symptom of heart attacks.
B. Heart attacks reduce blood flow to the heart and cause coronary artery disease.
C. Coronary artery disease can reduce blood flow to the heart and cause heart attacks.
D. Heart attacks occur when coronary artery disease is treated.
C) Coronary artery disease can reduce blood flow to the heart and cause heart attacks
CAD (or atherosclerosis) affects the vessels that supply blood to the heart muscle. It is caused by deposits of calcium, fat, cholesterol and fibrous tissues, which makes the lumen of arteries narrower. And due to inadequate supply of blood, the heart muscles get damaged. This can lead to a heart attack!
what is psychasthenia? Please don't copy and paste from g,o,o,g,l,e.
Answer:
Psychasthenia is a neurotic state characterized especially by phobias, obsessions, or compulsions that one knows are irrational.
Which statement is not true about the field of science?
it is based on observations and explanations of the natural world.
You are right with your answer please
Actual Question:
Which statement about the purpose of the field of science is false? (1 point)
Science is used to investigate the natural world.
Events of the natural world can be explained by science.
Science works to establish a collection of unchanging truths.
Useful predictions come from derived explanations of science.
Answer:
Science works to establish a collection of unchanging truths.
Explanation:
I took the test
Aquatic biomes: Briefly describe some of the characteristics of each of the following: Lakes, Wetlands, Estuaries, Intertidal zones, Coral reefs.
Explanation:
lakes is large in its wide and stagnant water from different water bodies like river, wetlands
A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the appearance of bacteria transformed with this plasmid if they are spread on plates containing ampicillin and X-gal
Answer: White colonies that are resistant to ampicillin.
Explanation:
The lac operon is an operon required for the metabolism of lactose in enteric bacteria such as Escherichia coli . It has three structural genes, a promoter, an operator and a regulator, all regulated by the availability of glucose and lactose. The lac repressor, a protein, senses lactose and blocks transcription of this operon. It acts as a repressor when lactose is present. A catabolite-activating protein (CAP), on the other hand, acts as a glucose sensor. The bacterium should express the lac operon only when lactose is available and glucose is not available. Thus, genes can always be transcribed, except when the Lac repressor protein is bound to the operon region, for which it has a high affinity (i.e. in the absence of lactose), where the Lac repressor protein maintains its high affinity for the operon region, preventing RNA polymerase from transcribing the structural genes. Thus, the system remains closed with consequent energy savings for the bacterium. In the presence of lactose, it binds to the Lac repressor protein and generates a conformational change that decreases its affinity for the operator region. Thus, the operator region is left free, RNA polymerase can freely transcribe the structural genes and the synthesized β-galactosidase (an enzyme) can degrade lactose to glucose plus galactose for energy.
Thus, the lac z gene encodes the enzyme β-galactosidase, which catalyzes the hydrolysis reaction of lactose to glucose and galactose. In gene cloning experiments, a compound called X-gal is used as an indicator of cells expressing the β-galactosidase enzyme. X-gal is hydrolyzed by the enzyme to galactose and another compound that is oxidized giving an insoluble blue compound. Thus, if X-gal and a β-galactosidase inducer are dissolved in the medium of a culture plate where the transformed bacteria is found, colonies grown on the plate that possess a functional lac z gene (either because they were not transformed by the plasmid, or if they were but the plasmid does not have the cloned fragment or gene that disrupts the lac z gene) can be clearly distinguished by their blue coloration. If they have another gene inserted interrupting the lac z gene, they will not be able to produce the enzyme that degrades X-gal, resulting in white colonies since X-gal is not degraded giving that characteristic blue color.
The white, non-transforming colonies are eliminated by adding an antibiotic to the medium for which the plasmid provides resistance (in this case ampicillin), so that we can select the recombinant colonies that carry the vector with our sequence, simply by their color.
So, if bacteria are transformed with a plasmid (with ampicillin resistance) cloned with a gene that interrupts the lac z gene, the bacteria will be white because they do not synthesize the enzyme that degrades X-gal and will be resistant to ampicillin.
Which of the following describes a predator?
A a fish that is killed and eaten.
B a bear that kills and eats fish
C a worm that lives inside a bear
D a bear that has a worms in its gut.
Answer:
b
Explanation:
a predator is a bear that kills and eats fish
Answer:
B. bear that kills and eat fish
Anaerobic Respiration of Yeast
1. Describe at least one part of the experiment procedure you thought was
essential for getting good results. Did you find that certain steps in the
procedure had to be followed carefully to get consistent results? If you wanted
better results, do you think there is a step that could have been added to the
procedure?
2. Discuss your thoughts on the overall lab design. Did it help you understand the
concepts better, or did it raise more questions? Do you think you could have
designed a better experiment? If so, explain how and then discuss it with your
classmates. Share some of your knowledge with them to learn a little more
about this experiment.
Anaerobic respiration of yeast produces ethanol and carbon dioxide, which can be experimentally tested by determining the rate of CO2 production in a closed system.
What is anaerobic respiration?Anaerobic respiration is a series of chemical reactions by which certain organisms can produce energy (ATP) in absence of oxygen.
Anaerobic respiration is useful in experimental settings to determine the survival rate of yeast, which can be determined by measuring the concentration of products of this process.
The experimental procedure requires the use of a closed system to determine the rate of change between reactants (glucose) and products (ethanol + carbon dioxide).
In conclusion, Anaerobic respiration can be experimentally tested by determining the rate of CO2 production.
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A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to drop?
Answer:
The molecules in the water spread apart. The molecules in the thermometer's liquid spread apart. When a thermometer was placed in water to measure the water’s temperature. the molecules in the thermometer liquid which is often mercury spreads apart and rises, this shows a temperature increase in the thermometer.
The rate of capillary filtration and reabsorption are increased when......... .
A) the negative pressure of interstitial fluid is reduced
B) the pressure of oxygen available to tissues is decreased
C) intravenous pressure is increased
Answer:
Mechanisms of enhanced transcapillary filtration in response to elevations in arterial or venous pressure. Elevations in arterial (Pa) or venous (Pv) pressure increase capillary pressure, which favors enhanced capillary filtration (Jv).
option"c"
15. Assuming the fluorescence threshold is set to be 1. Which gene has the highest gene expression rate? What is the Ct value? Gene with highest expression = ______________ Ct value = _______________
Answer:
The correct answer is - Gene 1 and 14.5 (or 14).
Explanation:
The cycle threshold is denoted as Ct value. It is the cross point at the threshold line meets with fluorescence signal reaction curve. In the given RTpcr experiment, the threshold line is fluorescence intensity 1 thus, Ct value for each gene will be the point at which each curve meets the fluorescence intensity line at 1. Ct value of is inversely proportional to amount of nucleic acid in the given sample.
Here, the Ct for gene 1 is the lowest, so the amount of DNA would be highest.
Gene with highest expression= Gene 1
Ct value= 14.5
What were the three large, flightless birds with similar features found on different continents, Australia, Africa, and South America?
Answer:
Rhea from south america
Emu from Australia
ostrich in Africa
With increases in CO2 in the atmosphere, _______ are expected to experience the largest temperature increases, while __________ are expected to experience the least.
Answer choices
high latitude oceans; high latitude land surfaces
high latitude land surfaces; low latitude oceans
low latitude oceans; high latitude oceans
low latitude land surfaces; high latitude landsurface
Answer:
The first option would be the best.
Explanation:
The oceans heat up first before the atmosphere does.
Question Mode Fill in the Blank Question Fill in the blank question. In cells that contain a nucleus, the DNA is divided into multiple linear chromosomes which are organized into a complex structure called
Answer:
The correct answer is - chromatin.
Explanation:
Chromatin is a part within a chromosome consisting of DNA and protein. The DNA carries the cell's genetic instructions and these are complex structures present in multiple linear chromosomes.
The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus.
Nguyên nhân gây bệnh quáng gà ở người là do:đâu
Answer:
nearsightedness, or blurred vision when looking at faraway objects cataracts, or clouding of the eye's lens retinitis pigmentosa
Explanation:
Fermentation preserves food and retains its original flavor as well as increasing its shelf life
Answer:
Yes it does
Explanation:
What are the two main phases of the cell cycle
Answer:
interphase and the mitotic (M) phase.
Explanation:
The stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase.
Answer:
The interphase & the miotic phase
Explanation:
A 17-year-old student has experienced reversible, periodic attacks of chest tightness with coughing, wheezing, and hyperpnea. She states that expiration is more difficult than inspiration. She is most comfortable sitting forward with arms leaning on some support. X-rays revealed mild overinflation of the chest. Results from laboratory and pulmonary function tests are as follows:
• Frequency 20 breaths/min
• Vital capacity (VC) 2.9 L
• FEV1.0 1.4 L
• FEV1.0/FVC 56%
• Functional residual capacity (FRC) 3.89 L
• Total lung capacity (TLC) 6.82 L
• PaO2 70 mm Hg
• PaCO2 26 mm Hg
• Pulse 108 beats/min
• BP 120/76 mm Hg
Intermittent use of a bronchial smooth muscle dilator (1:1000 epinephrine by nebulizer) for several days caused marked improvement, resulting in the following laboratory and pulmonary function tests:
• VC 4.15 L
• FEV1.0 3.1 L
• FEV1.0/FVC >75%
• FRC 3.7 L
• TLC 5.96L
• PaO2 89 mm Hg
• PaCO2 38 mm Hg
• Pulse 129 beats/min BP 122/78 mm Hg
1. What is the disorder of this 17-year-old student?
2. Is this primarily a restrictive or an obstructive disorder? Why?
3. Write the formula for determining residual volume (RV).
4. Determine the residual volume (RV) before and after the use of the bronchodilator.
a. RV before using the bronchodilator:b. RV after using the bronchodilator:
5. Why is expiration more difficult than inspiration in this person?
6. What does the change in pulmonary function after the bronchodilator therapy indicate?
7. Why does the bronchodilator exaggerate the tachycardia?
8. What causes the hypoxemia and the hypocalcemia in this person?
9. A beta2-adrenergic agent was prescribed for further use because it has less cardio stimulatory (beta1) effect. Based on your knowledge of beta1 and beta2 receptors, why is this a good suggestion?
10. An anticholinergic agent was also suggested as a possible nebulizer agent. How might this helps the breathing problem?
Answer:
Frecuencia 20 respiraciones / min
Explanation:
Imagine you found S. aureus to be resistant to Penicillin by Kirby Bauer analysis, but susceptible to Penicillin treatment in liquid culture (in other words, a MIC was determined). Which of the following are possible explanations for this inconsistency?
a. The concentration of Penicillin was higher in the Penicillin antibiotic disk than that used in liquid culture treatment.
b. The Penicillin disks used for Kirby Bauer analysis were expired/no longer active.
c. The concentration of bacteria was lower on the Mueller Hinton plate for Kirby Bauer analysis than that used in liquid culture treatment
Name three ways that humans benefit from the use of seedless plants
Answer:
They support life by being the first vegetation to spring up on harsh terrain where soil is scarce. Even when they perish, seedless plants give back to nature. Certain seedless plants like moss and liverworts actually leave behind a layer of fertile soil for other plants when they perish.
Explanation:
Seedless plants have historically played a role in human life through uses as tools, fuel, and medicine. Dried peat moss, Sphagnum, is commonly used as fuel in some parts of Europe and is considered a renewable resource.
Igneous rocks turn into sediments through the process of ______.
A . Erosion
B.crystallization
C.melting
D. Deposition
Which level of organization includes all the other levels of organization?
answer : biosphere
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Answer:
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
Answer:
biosphere
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
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what is the difference of biology and human and social biology ???
Biology is the branch of science.
Human biology is the branch of biology that focuses on human beings and human population.
Social biology is the branch of biology that is the study of social behaviour of animal and human.
Answer:
Biology is the study of living things.
Social biology studies human and animal behaviour.
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Explanation:
what is DNA fingerprinting?
Answer:
DNA fingerprinting is a technique that simultaneously detects lots of minisatellites in the genome to produce a pattern unique to an individual. This is a DNA fingerprint. The probability of having two people with the same DNA fingerprint that are not identical twins is very small.,,,,,Answer:
It's a laboratory technique used to establish a link between biological evidence and a suspect in Criminal investigation. It's also known as genetic fingerprinting.
In mitosis, the results are 2 different haploid cells.
ASAP please!!!
Answer:
In mitosis, the results are 2 different diploid cells.
Explanation:
Mitosis is an exact replication of the parent cells, making them diploid cells. 4 haploid cells are the result of meiosis.
Answer:
When a haploid cell undergoes mitosis, it produces two genetically identical haploid daughter cells; when a diploid cell undergoes mitosis, it produces two genetically identical diploid daughter cells. ... In contrast, meiosis is considered a “reductional” form of cell division that occurs in diploid germ cells.
Una de las aplicaciones más importa del electromagnetismo son
Answer:
Las principales aplicaciones del electromagnetismo se emplean en: La electricidad. El magnetismo. La conductividad eléctrica y superconductividad.
Explanation:
What is the correct order of amino acid if the sequence of bases on DNA were as follows: C-C-T-C-G-A-T-T-C-A-T-G
glycine, alanine, lysine, tyrosine
2)
alanine, proline, lysine, tyrosine
3)
valine, aspartate, glycine, proline
4)
aspartate, glycine, serine, valine
Answer:
it should be G-G-A-G-C-T-A-A-G-T-G-C
Explanation:
A=T
C=G
think of them as opposites. invert them and you'll have the answer (its easier if you write the answer right underneath)
The amino acid sequence should be G-G-A-G-C-T-A-A-G-T-G-C
G-G-A: glycine
G-C-T: alanine
A-A-G: lysine
T-G-C: tyrosine
What are amino acids?
Amino acids are molecules that combine to form proteins. Amino acids and proteins are the building blocks of life.
The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid. There are 64 combinations of 4 nucleotides taken three at a time and only 20 amino acids, the code is degenerate (more than one codon per amino acid, in most cases).
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If Sarah had skin vesicles on the anterolateral region of her neck, which peripheral nerve is infected by the virus? To which peripheral nerve plexus does this nerve belong?
Answer:
The correct answer is -
- transverse cutaneous nerve
- cervical plexus
Explanation:
transverse cutaneous nerve is infected by the virus that causes skin vesicles on the anterolateral region of her neck. It belongs to the cervical peripheral nerve plexus.
